The Fox-Men films really did overdo him(while somehow not actually getting him right), I'm fine with the MCU not leading with him, but he is an important character to the franchise, love or hate him. He does complicate things, though, in the MCU. We already have Captain America as an elderly old man from WWII, can they really do it again? And if not that way, then they have to have some sort of "the Stranger took him to space", or "he was in a freezer for most of a century" to explain how he hasn't been taking over the MCU world already for the last few decades.