>>149972695 (OP)
Originally, no. After twenty or more years of X-Men comics blaming and shaming other heroes for not being there to protect the mutants from the villain of the week, or even using other heroes as the establishment's heavies sent to prevent an X-Men chimpout, just keep them separated so this crap can never happen again. From the early 2000s onwards, virtually everyone who writes X-Men seems to want to write X-Men as a saga about gorillions of mutants emerging all over the world, and refuse to stop trying to wreck the "world outside your window" concept that Marvel was built on. If that's what they want, that's absolutely something that should be kept separate from the rest of Marvel.
And the "shared universe" should only ever have worked in terms of "these characters are in the same world, sometimes they meet and team up or fight". The writer of one book shouldn't be allowed to do anything negative with guest stars from other books, and shouldn't be allowed to impose any changes on characters from other books either.