First up tne following is for the live playing guitarist.
The kemper is as easy to tweak as an amp because it has the same knobs.
The Kemper is easy on the back.
The Kemper sounds and feels like you're playing a real amp
(Not according to everyone I've spoken to)
The kempet takes up less stage and less space in your car.
Not a selling point for me, though I can appreciate that it is a consideration
The Kemper using an FRFR represents exactly what's going out front
What if you like the tone from your cabs, not the mains?
The Kemper lowers your stage volume and gets people off your back about volum
Again, not a problem I have
I certainly appreciate how some need the security of using what tney always have and this is why the Kemper doesn't interest them.
I listed my main reasons below
I've been playing highend tube amps since 1938

and I too didn't want one but once you play and use it putting in a little effort you soon come around.
I'll go out on a limb here and say that the Kemper and its technology is the future. For those who aren't interested you'll be left behind as times HAVE changed for tne local gigging guitarist.
No before you all want to lynch me I WON'T be selling off my stash of tube amps ad I'm still a big fan but ignoring the Kemper is a bad move on your part if you're part of a live gigging band.