5H are actually pretty good from what I can remember. They rely on backing track during the choreo intensive parts of course. I think Dinah and Normani have lipped a few times which is awkward cause the rest of them didn't.
there are a few singers that I think NEED to start lipping, though..
especially if their vocal ability fluctuates every 6 months (i.e- Kelly Clarkson, Demi Lovato, Adele) ..their intonation always drives me crazy. I swear Demi and Kelly are always underpitched ..like how hard is it to actually sit on the note!