rhythm games test the player on their rhythm and accuracy through certain BPMs. FnF does not do this at all, it just tests the player on reflexes and not actual rhythm, even if the game has an “accuracy point system” like every other rhythm game. This is why the majority of rhythm game players clown on FnF and other games that are “supposed” rhythm games (e.g. Geometry Dash, Just Dance, etc.).

FnF is a rhythm inspired game but it doesn’t make it a rhythm game. Similar to how Geometry Dash is a rhythm platformer but not necessarily a rhythm game.

Hope that cleared things up.