As a dancer, getting a second dancer in DF is pretty demoralizing: three QoL pleas.

[Harmonea]

That's the downside to buffing jobs.
Double Ninja has to deal with Trick Attack shifting, can be a real pain.
To lesser extents:
Dragoon has Battle Litany.
Tanks often overlap Reprisals.

These examples are valid things that should also be looked at.

However, none of these directly screws over the buffer who goes first in the way that tech step esprit does. When a second dancer overwrites a tech step, the first dancer immediately stops getting a large part of the benefit of that buff. It's an adversarial interaction in that the second buffer's mistake not only costs the group their double-duration buff, but it directly hurts the person who went first. So it's not as comparable as you make it out to be.