Retcon Prometheus? Weyland-Yutani already merged for Alien TV series and Alien: Romulus

I'm sorry but I really hate how modern movies now have to retcon out films that aren't popular. This is reminding me of how the newer Resident Evil remakes are just retconning away their older games storylines that were crucial to the Resident Evil continuity until 2019.

I wish they would put all the movies together. I find it very confusing.

Yutani didn't show up until Alien3 or Alien Resurrection. Those movies were so awful I always confuse them.

Wrong. Weyland Merged with Yutani in 2099 for film continuity. The merger appears to have happened much earlier in Alien Earth's timeline. Until Earth a Yutani has only ever been depicted on screen once in AVP Requiem. That actress also did scenes for The Predator but the scenes were cut. Alien Resurrection doesn't have Weyland Yutani, it has the United Systems Military. 

Thank goodness the series and films don't share the same timeline, officially. Cause yeah it would have caused so much confusion.

Weyland Yutani really is the only major discrepancy between Alien Earth and Scott's prequels. The Maginot launched in 2055 under WY meanwhile it was still just Weyland Corporation in 2093 when the Prometheus landed on LV 223. It does at least seem like Noah Hawley wasn't allowed to do anything with Weyland. No direct nods to that half of the company.