Originally Posted by Drip

Depends on whether Dendro's other skills and her stats are on par with other rainbows. It's very possible they gave her a weaker version of the ability trigger because she already was too powerful.

Compared to BB (picked her because she's a Hit-All skill rainbow that is apparently very popular)
D: 13280 HP, 4370 A, 1670 D, 530 S - 2.4x to 3 (all unless we get fights later on with more than 3 enemies) - 24-34%
BB: 11900 HP, 4770 A, 1680 D, 430 S - 2.2x to all - 24-34%

Passives:
D: +18% A for 4 including self - x2 skill activation for self on 1st turn
BB: +35% A for 2 including self - +15% D for all

If we keep in mind D's skill is 2.4x to all with 24% base rate, this is already borderline OP since she activates every other 1st turn to hit all enemies for 2.4x her already high base damage, and will do more damage than BB over the course of multiple fights.