If you shift gauge-usage onto an oGCD, might as well remove the gauge.

This is a problem a lot of jobs have: Their only actually complex gameplay is trivialized because the abilities needed to handle it are either oGCDs, or naturally align to work themselves into a steady cadence.

The whole thing of playing Dancer is to not overcap your stuff while still using things "as fast as possible". Part of that challenge is that using 50 gauge requires a GCD. Remove that, and there is no challenge at all any more in that part, so there's no reason to keep it around: Might as well remove the gauge, the whole skill, and increase potency of other skills. It would just be unnecessary RSI-inducing button bloat at that point.