to add onto that, if you have girls that increase skill chance, then that makes it more worthwhile for the skillblooms...
consider Kerria's lv5 skill with my team's total of 1.6 times skill rate... that takes her 36% chance and makes it 57.6% chance to activate... but if left at lv1, it'd make a 26% chance become 41.6%...
that's quite a noticeable difference...