It's not complicated. It's just difficult to get consistent results and there is a learning curve to it. Most professional profilers end having a particular guitar or guitars that gets them the best and most consistent results, and they also tend to repeat the same pattern of things they play while refining.
But for someone trying to get their first profiles it is not easy to know if you should play chords, some single notes, do palm mutes because that is the style you play...
In the end the Quad Cortex might get better or worse results, but it will certainly appeal to those looking for a simple capturing process.
Yes I get your point, but I would assume that more people have problems getting their cabinets in a separated recording room and compare the results of the profiling/refining process with the original sound without hearing the cabinet. And also not every "professional" profiler has such an environment. Some of them are just producing sounds and don't care so much if it's totally spot on, I don't want to blame them if it sounds good it sounds good no matter how it is done.
Perhaps there could be an official tutorial in which different refining approaches are compared and shown how the sound changes. But this would lead to situations where people copy this process and than complain about that it doesn't get the same result in their environment. I also have my chain which works for me and feed a DI signal back for refining to get the results from which I know they work for me. And as you wrote this is kind of a learning process. But for me, refining gets often over-mystified.
And yes, the QC is a lot more setup and forget and that's absolutely a point. Even as it takes around 4:30 for the process. I'm wondering if there would be any way to improve the Kemper profiling process be increasing the measurement time due to automated refining and perhaps other tools wouldn't they've not already done that? Really, I don't know, perhaps some day they come around with a new measurement approach but I have the feeling that in the last 10 years they might have tried a lot of this internally.