Knowing that doesn't mean I have to or will accept it!
That's something we should have learned from Goldilocks as a kid, it's doesn't have to be "too quickly" or too slow, how about aiming for just right?
It is just downright puzzling why such a high profile title and set of characters such as X-Men would have to go to the back of the que, especially behind the likes of Ms. Marvel or She-Hulk or other 3rd tier characters that are part of their "plan". Plans change all the time and you don't let such a profitable franchise sit collecting dust for 6 years.
A couple of things. Disney did not acquire FOX until March 2019. Disney/Marvel has done what you dislike so much since their merger, namely plan all this stuff out years in advance.
2019 is important to kinda understanding their basic operating formula. In August 2019, Kevin Feige announced
Moon Knight,
Ms. Marvel and
She-Hulk. Let's take
Ms. Marvel as an example. Casting call did not go out until early 2020, likely around February when Iman Vellani sent the studio an self-audition tape. Filming did not start for the series until November. The finished product did not hit Disney+ until last month.
That is 22 months from an
official announcement to watching it on television. Of course, a certain worldwide event (that will not be talked about in this forum) extended the process for certain. No argument. What I want to emphasize is that Feige & Company likely had the series on the drawing board WELL-before the official announcement. I would gues-stimate 12 months prior at minimum. And note, the character was already a Disney property already.
Let's fast forward to Feige's official upcoming phases announcement in December 2020. He hits us with in-production announcement concerning an FOX property acquired 19 months before:
Fantastic Four. I have zero proof but that indicates to me they already had an actionable plan ready to activate after getting the FOX deal finalized. And that their number one launch priority was the FF and never the mutants.
My opinion? X-Men are on-schedule. They wanted a buffer between the past FOX movies and what they envision. No buffer was needed for the FF because the 2015 release was largely forgettable
and a dud. The main issue is that we, the audience, have no clue what the schedule is.
Even so, I extremely doubt there was any pre-planning session held that included strong advocates for fast-forwarding any X-Men projects. And I say that thinking there are zero proponents of standalone productions in the MCU as there are in the DCEU. I honestly do think they want everything to "fit" together without any stragglers.