There are also more minor details to be dealt with, like Magneto’s origin being that of a Holocaust survivor, which would make him either at or pushing 100 in the present day.
These aren’t details that necessarily need to be removed, but there needs to be some tweaking and explanation in the MCU if these story elements remain in place.
It’s a fine story, albeit one that’s somewhat embedded in time.
Pre-internet and smartphone use, it’s completely feasible that one man set off, discovered mutants and kept them guarded in safety, but in this information age, it is not likely.