The difficulty in defining it certainly makes it hard to talk about. And it makes it impossible to even conceive of how one might detect this phenomenon in other people, or even come up with any sort of theoretical framework around it.

But if "the issue" is that this difficulty means I can't really be sure it's even there, no. As I said, this is literally the only thing I can be 100% sure exists. For everything else, there's room for at least a little doubt. This world, the room I'm in, the computer I'm using, even my own body could all be illusions. But my own consciousness is definitely real.

If you don't feel the same way about your own consciousness, then as I said, you're either taking the piss, you're very confused, or you just don't have it.