But here is the rub.
How much do we need to call out?
I'm going to go back to One Piece. There is a weird thing that people have noticed about the series. Some people, inexplicably, are BIG.
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There... is no real explanation for this. No real pattern. Sure, there are giants in the series, but none of these characters ever even hint at having Giant blood or being related to giants. They are just... huge people.
And, sure, there are people who investigate, who come up with theories, because there are massive mysteries in the One Piece world and everything seems to be done with purpose and intent... But most of us just accept that these people were just born big. And that if they get old, they will shrink small. Hyogoro the Flower was a massive dude in his youth, shrank down to three feet tall in his old age, then in the final battle flexed and grew to eight feet tall.
And... did Oda NEED to explain any of it? Does the fantasy world break down if we have super tall humans? OR humans who can change their size drastically? I don't think so.
And this is where I come at this from in terms of high level characters performing incredible feats... It kind of doesn't need an explicit explanation that these things are only possible because of [X]. First of all, explicitly making [X] something means it starts cutting out other concepts. We can't have fighters shattering stone because of their fighting spirit if we declare that they do so because they all learn the Iron Bones technique and have reinforced their muscles and skin with magic. I like being able to match the "power source" to the specific character. But also... as long as it isn't a spell, then it doesn't matter. The only thing it is doing is telling people their dragon-slaying, demi-god fighting human fighter isn't like a US Marine and is something more impressive. We... kind of know that. It is a fantasy game, and we are playing fantasy heroes, and even if we are playing human fighters... it seems we kind of accept that they can do some crazy fantasy feats. Without having to define them as "this is a magical training technique" or "this is because of soul refinement" or whatever other explanation we could possibly come up with.