[mattdesl]

Has any of this actually happened to you with focused modules like to-dash-case?

There is no reason for such a focused module to go out of style. As with many other small modules, the API and major version is locked barring some catastrophic event. Maybe there is a rare edge case that will break, and then you end up with two modules which are both useful in their own regard (like point-in-polygon and robust-point-in-polygon).