I wonder how they'd get it to work honestly. I'm not sure how far they'd go with a mix mechanic for healing. If a dps messes up a mudra or dance, oops they lose some dps, not the end of the world. Not so sure they'd want to tie important healing mechanics to mixing though, and they seem adverse to giving healers much in terms of dps mechanics now.

Maybe as a sort of analog to cards where they mix to give a party buff?