8 bits 4:2:2 on mirrorless cameras?

I was looking for some cameras that can record 8 bits 4:2:2 internally, and I found some that can record 10 bits 4:2:0 internally (like the new Fuji X-T3), and the GH5 that can record up to 10 bits 4:2:2 internally. But I never saw any camera that could do 8 bits 4:2:2. Why? I imagine that both of the cameras that I mentioned before could do that, correct me if I'm wrong please. And, is really 10 bits 4:2:0 better than 8 bits 4:2:2 for a non high-end purpose? I read something like the 10 bits can't be appreciated by the general consumers monitors and tv's. Sorry for my english and thanks in advance!
 
And, is really 10 bits 4:2:0 better than 8 bits 4:2:2 for a non high-end purpose?

Yes and no. It's situational.

I read something like the 10 bits can't be appreciated by the general consumers monitors and tv's

I've read that the minority can't tell until it goes beyond 13 bits, but the majority can tell up to that point.
 
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