[Spoiler] Isn't Dark Knight using Akasa ?

[Veloran]

I don't really understand the backlash against dynamis, but maybe it's the physics analogy, or that even in the fantasy I read with hard magic systems (Brandon Sanderson comes to mind),

A very pertinent lecture.
And more.
And more.

Timestamped for your convenience, though I suggest you watch the whole thing. But basically people are given to dissatisfaction with Dynamis because it is effectively a new magic power invented to solve a problem at the 95% mark of the story. It's not as grounded as aether, which is already like midway on that scale there, but neither does it have much in the way of a sense of mystery because they basically explained how it works - sort of - with the caveat that it can effectively do anything. So it is neither "magic as science" where the reader is impressed by how the writer cleverly solved a problem using well-established rules, but neither is it "magic as wonder" because it's fairly understood and directly viewed to the point of carrying the plot via powerscaling.

So if Endwalker is "the final chapter in the Hydaelyn and Zodiark Saga", Dynamis is the deus ex machina brought out in the last chapter of the book to wrap up all the problems. Hence unsatisfying.