If think you're right but it's because of that we're trying to find solutions to blend/mix amps the best way possible. Maybe in ten years we'll never talk about that anymore.
dhodgson and I gave two solutions. Maybe Chris Kemper has another one. I hope he'll give us his opinion.
The solution to tracking is simple. Its what is actually quite often done in a studio which is to record a dry track and reamp or to simply double track. The live scenario is the only case which the Kemper just really can't handle dual amps. The more I've read about people wanting to mix profiles, it seems most are talking more about layering in which both sounds are distinctly audible in the end mix (like mixing a clean and distorted amp). The only way to do this is with loading dual profiles. While The idea of mixing 2 amp's tones to form one sound (the sum of both amps) presumably so each amp answers a tonal deficiency of the other can largely be accomplished by the deeper amp and cab parameters (pick, clarity, definition, cabinet character, cab low and high, etc). I posted this before, but it probably bears repeating. When you have a device as advanced as the Kemper, often you simply need to think inside the box and forget the traditional ways in which you might address a tone issue, rather look at the tools you have at hand.