> but they don't seem to be easy to use on emoji keyboards
On iOS, at least, it's a simple 'press-and-hold' to get the variants which then persist.
> Do people care enough to choose the correct skin tone and stuff?
I have, yeah, at least on the ones I use regularly. It would be great if the OS could notice that I've changed N of them and offer to set the default for the rest rather than me having to do it each time, mind.