I actually think this is perfectly fine- Hyrule Warriors simply did what Smash should be doing, which is taking the basic concept behind a character (or creating new ones, provided they fit (i.e. Tetra with a gun)) and expanding upon them to create a moveset that functions in the game. While Smash would most likely become rather derivative of Hyrule Warriors if it tried to make movesets for some characters like Marin or Medli, I'm confident it could create unique (even if at least a little similar) movesets for others like Tingle, Phantom Zelda, or really anyone from Age of Calamity's roster with the same exact design philosophy (just written for a Smash context and not a Warriors one).