It seemed that the most obvious rationale was the 'company' has a fairly open "recover any alien stuff possible" directive for their androids, so when the Nostromo reported a contact, then maybe Ash sends a prelim report, then it goes dark until Ripley is recovered. Based on her interview they call the colony to check it out, that goes dark, so they send Burke along with the marines to sort it all out. Don't really need for anyone to know much, if anything, about xenos specifically outside of what we get in the films.
Well, yeah, what I meant by not knowing a lot is that they knew about the Xenos, the derelict, but in general, not knowing exactly where they came from, the exact specifics, at least I'd like to think so.
I'm not fond of the whole there were at least a few humans that knew everything all along cliche.
I think the overall design aesthetic of the Aliens universe, kind of a cold, harsh, ruthless and exploitative vision of humanities future mixed with really alien aliens, whether you throw in the predator yautja or not, has plenty of room for exploration. The Engineers and the black goo I'm not overly fond of, mainly because its overly religiously themed, but I can tolerate it if it's not saddled with really dumb horror movie tropes like Prometheus and especially Covenant.
We may be feasting well if this show and Badlands can deliver. If that Robocop Omnicorp show ever materializes we might even get a hat trick of 80's sci-fi IP, even more so if someone gets off their ass to refresh "They Live" (how, How HOW THE MUTHAFUCKING FUCK has this not happened yet???) and maybe even a bit of The Thing tossed in there again. I've kinda given up on Terminator stuff but who knows, maybe.
I may be in the minority here, but I don't like the Predator in the same universe as Alien.
As for the Alien universe, of course it's full of possibilities, but it's not a novelty anymore and Giger's design was a big part of the appeal.
The 1st one was a standalone thing and it's a different beast than any other in the franchise, even Aliens. It's a horror at core and it had the Xeno left, right and center. Everything that happens had to do with it, no hero, no romance and it does something unique, it keeps the alien fresh by evolving its nature and appearance. And you know, what if that final form we see isn't truly its final form?
So, throwing other creatures and different themes and connecting them all with prequels on top, it deviates from the original a lot, not necessarily a bad thing, but so far it's sort of a mishmash.
But I'm keeping an open mind for the show, it can do its own thing very well as long as the Xeno isn't there just for show.