As a Carnelian simp, hear me out it's worth the wait for the amount of damage, especially when you use aak before popping skill and the second module drastically improves uptime, even better with ptilopsis
Surtr kills the boss Viviane duels the boss till the rest is ready also she is very good in Stages with many low Res enemies where using Surtr S3 would kill only a small amount before retreat
The worst thing is that she has been done dirty both in gameplay and story Like when reading the Virtu event I would assume that Ebenholz would take all the pity points, but Vivi controbution to the story is pretty much only pity Shes removable from the event and thats just sad Her boring gameplay cant save her and her base skill cant do it either Shes meant just to be ur home screen op, Idk any other role for her
Funnily enough, I raised both Quibai and Vivi to lv80 and now Qui is seeing more use as I e2'd s3m3'd her, also, no matter how much Vivi acts mid, Tsukinogi *and Vigil still exist, so she has that going for her.
Wishing her talent is not by chance but by number of hit (3 exactly like her 3rd skills) to any enemy + multiple stack. This will a bit fix her as she can toe on toe with a lot of elite or to some extend boss which can be controlled during downtime.