Personally I’m very glad Disney bought and kept it, why? Two particular reasons:
1. Disney owning “both” Alien and Predator secures future Aliens vs. Predator movies, games, books etc.
2. A lot of people fail to realize that Disney has the funds to give us endless amounts of future Alien and Predator installments and merchandise, which myself as life-long dedicated Alien and Predator fan is what I want the most, I never want this franchise to end.
Fox wasn’t doing great, that can be seen with The Predator (2018) which was borderline lore sacrilege. Shane Black even had to do damage control via Twitter about the whole DNA harvesting business which went against Yautja laws and codes, confirming it was only one isolated Clan who practiced such things, something which desperately needed to be in the film.
Also a while ago a friend pointed out to me that Disney has owned Miramax Studios for the better of like 20 years if I remember correctly and that released R-rated films all the time.
Personally like every fan I would like the movie to be R but I won’t complain if it’s PG-13 and it “delivers” a solid Yautja story without contradicting established lore and the performances and atmosphere is on point.