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You could say the same for this scene

But the LV-223 could just be a Volcanic Desert kind of Landscape we have many such places on Earth including Volcanic Beaches with Black Ash like Sands

Why isn't it swarming like the 'ash' from the Engineer?  And why isn't the planet teeming with life?

Also, what is the signicance of that swarming matter?

In Spaights' draft the Engineer becomes a swarm of scarabs, rather than liquefying. Is something similar happening there?

Always thought they were just much smaller versions of the scarab.

That's what I think, too. I'm wondering if that means there were already humans on that planet. If the cell reproduction underwater was something other than what we think. 

"Why isn't it swarming like the 'ash' from the Engineer?  And why isn't the planet teeming with life?"

Maybe because the Goo needs Genetic Material in-order to do anything... like Hammerpedes from Worms... the Sacrificial Scene the World had some kind of plant life and algae, which means it had to have basic native life.

This was how the movie seemed to show how the Goo works and like the Scarabs of Spaights draft....

But Fox may have decided to change how the Goo reacts and what it is... Fire and Stone shows LV-223 has evolved into a World full of Plants and Life, and Water.

From the Baron LV-223 we saw in Prometheus... i always found it odd....  but i thought maybe Genetic Material and Plant Life and those Ants (see normal and black goo ones) are something brought to LV-223 by the Crashed Colony ship from Hadleys Hope and it may have had Plant Life and Organisms that got infected..

But alas i think Fox had it the Black Goo can just create life from Nothing... and so a Urn dropped into a Sealed Room would eventually spring into evolution of its own..

However while trying to explain how etc in answer to your comment SM.... i do think that the dust etc on the surface of LV-223 has nothing to do with the Black Goo..

Its just a Volcanic Desert of a Baron World.

"Always thought they were just much smaller versions of the scarab."

in some part yes... this makes the connection more simple... replace Scarabs with Nano Worms... that grow like the Holloway Eye Worm... which by other means was hard to explain... a confusing element.

Not if the Goo David removed was a substance made from thousands, millions of Nano Worm like Tadpoles.... but then so its Sperm, its many many many tiny Tadpole like Organisms/Cells but it has a Gooey appearance.

Therefore these Nano Worms could be what infected Shaws Womb... Holloway was just a means to pass the Parasite from himself to Shaw without being detected..

Otherwise David would have to perform a invasive artificial insemination of Shaw with the stuff on his fingers.  (or prepare her with a Drink).

However Holloway was a Opportunity and maybe also he gave consent in a ambiguous way when he said he would do "anything and everything" to get his answers..

Maybe David could not just go and spike him off his own Agenda... but now David is free? who knows.

"Maybe because the Goo needs Genetic Material in-order to do anything... like Hammerpedes from Worms... the Sacrificial Scene the World had some kind of plant life and algae, which means it had to have basic native life."

It had the worms at the very least - it should be swarming with hammerpedes.

LV-223 also had a lot of snow, which could very well be water.

Indeed and with Water is the potential for Life....

Regardless if this was a oversight by Ridley, i.e the Sacrificial World maybe overlooking the shots before the Waterfall Scene showed Plant Life...  maybe the same was with the Ice caped Mountains of LV-223

Regardless.... those Temples Produced Water... and so either way, yes LV-223 is not far from being a place that Life Could evolve upon.

There are several ways to view the sacrificial scene, two very simple ones being:

A) a really well executed montage meant to establish a huge, primordial setting wherein certain details were not accorded deep consideration

or

B) a detail rich mass of information meant to cement a substantial plot element via visual cues.

I'm imagining it's a bit of both. In  many ways, Ridley and Damon are oddly suited to each other and who knows how much intellectual input Dariusz Wolski had as well, probably a lot. So it's possible an element like visible foliage was not an oversight. Of course I prefer to think it wasn't, I'm biased.

So I think there could be more to that scene, which is why I'm questioning the swarming matter, which appears to be a quote of the Scarab concept Spaights introduced. I really didn't go for the Scarab thing but there it is on film, maybe just a weird effect, maybe more? As in, maybe there's more to understand about that scene's place in the story? 

This is counter to my stance that too much is read into the inconsistencies of the franchise overall, but I do maintain that Prometheus is a celebration of the mysteries and debate that has characterized Alien for decades. 

The worms on LV223 were occasionally supposed by many to have come in on the astronaut's boots, but more likely, if they weren't indigenous, they came in with the Engineers. They could even be microscopic life that came in contact with the Liquid.

The Holloway eye parasite looks in many ways like a tiny Mr. T, enough so that I wonder if his body was becoming overrun with them, and he ejaculated one into Shaw. I don't find a connection with that organism and the sacrificial swarm.

"The Holloway eye parasite looks in many ways like a tiny Mr. T, enough so that I wonder if his body was becoming overrun with them, and he ejaculated one into Shaw. "

Hadn't thought of that.  Nasty.

My feeling on the worms is that they were indigenous to LV-223 or perhaps came with the Engineers.  Also, that they were 'in natural state', as we first saw them and then they 'evolved' after contact with black goo. So more of a story telling aid than any real significant part of the goo/Engineers methods. 

However, the dust in above image and the eye worm are very intriguing elements in the film.  

If Holloway infects Shaw in the way described by Aorta, how does it then fertilise/infect/adapt the egg inside of Shaw?  Also, why do we see the eye worm?  It does suggest that Holloway is now a host to these things and they are growing/multiplying inside of him - would he have changed into a big black worm eventually?  Is the goo made up of tiny worms?  We also have to consider that the Sacrificial goo was seemingly different to the goo in the urns.  My feeling is that the latter is a mutated version of the former i.e. tweaked to evolve Xeno/Deacon type life forms (and there could be other variants in the tombs on LV-223). 

I have a feeling that the Sacrificial goo is designed specifically to breakdown Engineer DNA so it can create life (as we know it) through the subsequent growth and evolution of DNA strands present in all life (on Earth - Paradise?)

It would appear that somewhere along the line some (?) Engineers either did experiments on the goo or used it in dangerous, forbidden ways.  This I would wager led to the destruction of paradise; but that tale we may see glimpses of in AC.

I'd always assumed the dust to be simply a breakdown of and changing state of the Engineers matter/DNA i.e., it's more passive and just 'flying on the breeze' rather than being a swarm of smaller entities.  ( I suppose you could argue that either way really and I think it is intentionally ambiguous).

In a Biblical/origins sense:  Perhaps the goo is both Demon and Angel?  It can create life that is harmonious, balanced, 'pure' etc but if used in other ways can bring about death, destruction and perhaps even a dark hegemony or the 'anti-engineer'/Xeno?

Was the Engineers 'task' to seed life and they then began to do so in 'non-official' ways which led us to events in Prometheus/Paradise?