Thing is, I get the reasons why people might have issues with "you are not a 100% be-as-were-born human, thus, you're a Bad Person". I really do, especially in the current political and social shitstorm we're living in for years by now.
Still, I absolutely don't think asking the question of "at what point you start to be less of a human ("less" as in "different" not "worse, necessarily)" is a bad one. I think it's a profoundly important one. Not because it makes you bad, but because of the psychological consequences. That the consequences are good, or bad, is a highly philosophical debate, but regardless, it will have consequences and it's a major part of nearly every work dealing with transhumanism.
Saying "meh, you're just as you were, with 90% of yourself changed to machine and perfectly fine, you just can't use magic" is a big step back. It's not changing the undertones of the discussion (augmentations=bad), but just glosses over the conversation itself lazily.