Saul J. said: This is, in my opinion, a much broader suggestion/idea/issue. A GM might want to allow other rules from Tasha's, but not the rules for Rangers, or might want to allow the optional rules for Rangers, but not other optional rules. Did you know that "Feats" are optional? So, this is really a much broader issue. See the post I recently made: Selection of "optional rules" For rangers they get the option of replacing Favored Enemy with Favored Foe and replacing Favored Terrain with Deft Explorer. The system currently adds all four options automatically which means, as Klitter said earlier, a player (or GM) is responsible for removing the features that aren't being used manually, which includes some language proficiencies and spells . To me as a person with absolutely no understanding of coding, this seems like the same kind of mechanic as when you're leveling up and have to choose a subtype or a class feature like an artificer infusion.