Okay fine.
We will offer the new abilities only to Eldritch Knights, Psi Warriors, Rune Knights, Echo Knights, Samurai and Arcane Archers. Champion fighters, Battlemasters, Cavaliers, and Bannerets will be barred from getting these abilities. That way, only the magical classes can do extraordinary stuff, and everyone else can be objectively worse, just like you want. Because, these aren't replacing subclass abilities, these were meant to be added to the fighter directly.
I'm sure all these people who want mundane fighters will be perfectly happy being denied access to abilities until they decide to have access to supernatural powers, and players won't start taking the magical and supernatural subclasses who are just as good in combat but far superior out of combat since they just flat out get more abilities.