I can imagine for a few tasks, manual method may be better. I do all profiling manually (Have not seen how to do it in RM?).
But, I would rather not own the Kemper than have to manually edit the 37 lines of description when making a profile. If you used the Kemper it would take you 20 minutes to do one profile.
I also have folders in the local library for IRs/Cabs, effects, amps based on style, specific profiles I used for each song (Gtr, Bass, Voc), etc, etc, etc.
I would never even look at a device that did not have a fully capable PC connection. So I guess I am lucky I got in once RM was fleshed out