Gammadoodler
Hero
Sure the Marvel universe is also mostly set on Earth. In the context of fiction set on Earth with real humans as the baseline, I think such an expectation is reasonable.Keep in mind no one is asking for historical accuracy, merely a better answer than "because reasons".
I accept, for example, that Captain America is a peak human. Strong, agile, tough, 20s across the board. Does things no regular person can. I can also accept that he is Worthy of Mjolnir in the fight against Thanos. I would not accept that he could start flying and shooting lightning like Thor during Ragnarok during Endgame. I'd want to know why and how. And "he leveled up since Avengers 1" isn't cutting it.
That's my cutoff point. Where suspension of disbelief occurs. A fighter who is "mundane" can do a lot of impressive things like Cappy does, but he's not doing Thor stuff unless he has a Thor origin. (Thorigin?)
With limited exception, this is not the case with D&D settings. To be honest, most D&D settings are more similar to Asgard. And on Asgard, folks can do a bunch of weird unearthly stuff. Some of it is magical, some of it is technological, and some of it is "just the way things are" for Asgard and its denizens.
Sometimes we get a justification, and sometimes we don't. But either way we're usually good because we know. Asgard isn't Earth and things don't have to work the same way there as they do here.
D&D settings and classes deserve the same level of license.