What I'm referring to is some stuff that is in Prometheus/Covenant was not in Alien, so they can't use anything from that film.
"Building Better Worlds", for example. There is no company motto in Alien, so they could either come up with a new one or use what is already established. So the question is, why re-invent the wheel, they already have a perfectly good thing that they can use.
As for the WY logo in Aliens, there's no reason why they couldn't use it in Alien Covenant. It's more recognisable to people. But they didn't, because it was in the original Alien. They had a choice between Ridley Scott's version and James Cameron's version, and they chose Scott's version. Hence why I said it is based on Ridley Scott's universe established in Alien.