No, I also think that it is a stupid idea. There are some things that they should let us wonder about.
An Alien prequel could explain some things but there are other things that are not that important. Sure we can be given a hint where it comes from but I am not interested in learning if it can smell tings, what they eat, and so on. What I am worried about is that the prequels will explain everything about it because then there is nothing left to think about which would be a shame. The Xeno shouldn’t be a meaningless creature like Bambi. Having the image of how it sees is one thing but we still don’t know how their vision is made up, from a physiological point of view and hopefully we will never learn about that.