swsh was mediocre but not because of dexit, the games were bad because they were severely lacking in exploration and content, also because of how terrible of a mechanic dynamax was. swsh could have all of the pokemon and it would still be shit
I would rather have a really good game with ~450 pokemon than a mediocre game with ~1000 pokemon
Dexit also means they can improve the models, textures, and animations by a great amount if they decide to not be lazy.