I think Riho has definitely grown and improved, and she's getting to do things more suited to her is definitely true. She really improved over the course of her MM tenure, too. But live and such to me, she still just sounds like her. Just as wonderful.
Miyabi I haven't heard much of 2.0, but I saw the duet thing she did with a H!P girl the other day and her voice still turns me off just the same.
I'm not active in it, as I'm not active in anything, but FYI for all there is a Riho fan group on discord, mainly made up of all the people she impressed while she danced for Babymetal lol. But they're quite active and chat a lot, if anyone's interested, let me know.