Ah, I get you.
You are of course right to an extent there are only so many ways to skin a cat within any given gameplay style.
That said it is still possible to make classes that feel (don't underestimate the importance of 'feel') and play entirely different from WoW. The Disciple of Khaine in Age of reckoning is kind of a debuffing fistweaver (but still sort of different), which is something wow wouldn't have for five years after that game launched and wow just straight up doesn't have support classes like the debuffing aspect of DoK or FFXIV Bard or Dancer.
My complaint wasn't the vague similarities of hotbar combat, my point was and annihilation marauder was a straight lift from a feral druid for example.