What is this class design of Dancer?

[Driavna]

Standard finish hits really really hard and I've been told you use it every 30s. Not sure of the math but I'll gladly believe it to play ddr twice as often.

Using every 30s is not a great idea, but let me explain why:

Standard finish needs 4 GCD, your regular single target (x2) combo is 900 potency vs 1000 potency from the standard finish. Sounds good, right? Sure, but there is a catch: dance moves can't generate flourish procs, and you want to generate as many procs as you can. After all, a dancer has 3 layers of RNG: Flourish-> Feather-> Fan III.

Edit: I was wrong, ignore this.