I don't like this one because "Fighter" means something else in the context of video games. "Character Action" seems broad, but anyone who discusses games knows the very specific thing it means.Character Action is dumb.
The correct term is Spectacle Fighter.
To the broader topic, I think most of the coined phrases for genres are fine, because often you're trying to describe very specific experiences that on description can sound similar to vastly different experiences. As someone else said, both DMC and Uncharted are "action games", but it's more accurate to say that they're both members of vastly different genres with other games that emulate their playstyles or that they are emulating. Metroidvania is better than something like "sidescrolling adventure" because a Metroidvania game is actually structured extremely specifically.
Immersive sim kinda sucks though, even I have to admit.