Part of it is because games have multi-year development cycles. And, for most of covid, WFH/remote was not something people really understood how to do (having kids around did not help). So basically all games lost 1-2 years of development time.
And for a major studio (like MS), you have limited support teams and resources. So if Ghostwire needed one of the support studios, DOOM Year Zero (!?!?!?!) would have to wait and so forth.
And then you just have release windows. It matters less in a digital distribution world, but you want your big games to hit for holidays and known good selling weeks. So if Starfield is end of Summer, DOOM can’t be.
And as you add on delays you need to improve the game because something else came out with a similar bit and you will come across as “derivative”.