I personally think modellers like the axe try to "fix" and make perfect the high gain stuff to much that it ends up being too smooth and unnatural. I have always had a problem with high gain patches in modellers until now. I think sometimes if we use moddelers too much, we forget what the real amps sound like, or should sound like. Moddelleritis. Which is why the kemper has some people who generally don't like moddellers, really interested in the kemper.
Besides if you want to smooth out a distortion, aim your mic more off axis...
but i agree that in general for most applications the gain knob can add unpleasantries and certainly not as functional as other modellers, but then again the kemper isn't really a moddeler, its approach is much different.