many profiles are not meant to be tweaked
Maybe bad ones. I've tweaked full on Dumbles to an awesome clean sound and a Clean Fuchs into a killer distorted rig.
I hear what you guys are saying!
But, it is often said that Kemper, while very accurate in sound, lacks the feel of a tube amp. Apparently, something like a Fractal Audio unit feels more realistic. I'm trying to add that feel back, using a tube power amp.
It's rumors from people that want to justify tubes. I'd take your favorite tube amp that you are very used to and profile it. Without knowing which is which you won't be able to tell the difference, Top studio masters and engineers can't with their Genelec monitors and million dollar studios so I challenge that you couldn't either. Unless you can hear the difference between a Duracell and Energizer in your tube screamer.