What is this class design of Dancer?

[Lemuel81]

I've been messing around with Dancer hitting a dummy and the whole class feels like a way worse MCH in terms of "50% chance to unlock an ability for execution":

• 2 single-target + 2 AoE abilities are always usable, also you can use Standard Dance on CD
• 4 abilities are of the "50% chance to unlock" kind
• 2 abilities are "50% chance to unlock after using a 50% chance to unlock ability"

How is this class any fun?
Pressing the same 4 buttons over and over, hoping that one of the other 4, any then maybe one of the other 2 will unlock.

There is (IMO) a good proc rate system (bard), and bad ones like this.