I honestly blame it on Kemper themselve....they never explained it well to the users how to do it..and why do it etc.
I had to explain it million times to users till they did understand it..and many still don´t understand it.
Also there is still a good official tutorial video missing
and there were many with bad results because of user error, so that some people think its not as good as a studioprofile
I always appreciated that your sounds are merged; turning the cab off on a studio profile simply is not the same. The process of merging is simply explained in the manual and can't be that hard to master. A short official video would probably promote the use though.
I use a combination of in ears and a cab on stage that faces in towards the band. The on stage cab provides that weight I miss from in ears and is good for other bandmates that don't like in ears. I could never get the FRFR to satisfy me for distorted sounds. All the time, our engineer is happy with the direct sound from the Kemper and no spill in mics.