One practical advantage that few people reference is that a replenishment regime means that your "working" developer" is always at room temperature - if room temperature is near 20C, this means no temperature adjustment.

I use replenished HC110 which is more complex than X-Tol, but otherwise very nice.

If I had a bit more room for storage, I would transition to replenished X-Tol.

It is so convenient not having to worry about wasting developer, due to the difference between the minimum quantity of developer needed to avoid premature exhaustion vs. minimum quantity required to cover the film in the tank.