I agree fox did some movies that allowed a greater flexibility on the storytelling front on some movies of the X-men, they didnīt try to do superhero movies, just a movie that had super heros as stars. I actually enjoyed X-men first class, Dark Phoenix(the last one) and Days of future past and if Matthew vaughn had stayed with them post X-men firts class I believe they would have grown to have a more coherent narrative and world more acording to the comics.
My only problem is that at the same time, Fox cut all possibilities of making the X-men a more adult version of the MCU by refusing to respect most of the original material as well as itīs bad handling of the characterizations for most characters, when the actors are more aware and care more for how their characters should look or act and have to make suggestions to make the story more coherent with their character like Olivia Month and Michael Fassbender did then it became obvious fox didnīt really had a big end plan or storytelling for the X-men beyond doing more movies for the sake of it, for Fox it seemed the X-men were a never ending story of Wolverine and friends so of course it made sense to kill all of them in the end, there was not much future for them there imo, in this the MCU does have the edge over Fox in which you can see that most stories there lead to a bigger storytelling.
The MCU does have a formula, they donīt like to take risks or deviate too much from it, it works for them very well but my guess is that they will have to do some changes to it soon if they want to bring to life parts of the MU that donīt quite are the type of stories in which it makes sense to joke all the time. I also like that sometimes they allow for some flexibility with the characters but keeping the essence of who they are, I actully like way more MCU avengers than comic Avengers and a big part of that is that is because the MCU managed to make most people care for their stories even if they are not quite the same of the comics.
So I know the X-men could get a bad characterization from the MCU but I am also optimistic at the possibility of seeing them live in a world more akin to the MU with a end plan for them.