I DO understand the basic question/point the op is making here. One of the biggest issues with all modelers since they started appearing years ago has been a sound that's more of a "finished" sound than that of the amp and cab just blasting away. The Axefx is light years ahead of those early L6 units, but I can see how using a guitar track that's been mixed and mastered (especially considering how squashed modern mastering has become) might not yield the most natural sounding results.
All that being said, I'm sure there will be a number of great patches from people who matched raw amp tracks.
I have a Kemper too so it will be interesting to compare results. The KPA is very cool, but anyone who says there isn't a difference between the real thing and the profiled version isn't listening carefully. It will be interesting to see how Cliff's mystical brain does with this kind of a concept.
cheers,
Steve