2) I think David Gilmour would kill himself rather playing and touring with a kemper, it's just complete nonsense, unless you like crap sounds
Saying that Kempers generally sound like crap is ridiculous, sorry.
This bashing of digital technology is getting tedious. It's like those people who think they need 24/192 downloads and they could hear all the differences.
I bet most of the people - even trained musicians and engineers - couldn't tell the difference between a good Kemper profile and a recorded tube amp, especially on a recording (provided the profiles have been decently created).
Even modelling (not profiling) has become so refined that it is hard to tell from the real deal. You would be astonished on how many recordings this kind of technology has been used now.
If you don't like the sounds MK get with his Kemper, it has something to do with the profiling and personal tastes - but not the capabilities of the Kemper.
Personally I don't like the sound of the Texas Specials in his Signature Strat. When he started using this with "retro" amps, it just sounded to harsh and edgy to my ears.
I'd rather have the smooth sound of the 90's or the bell like sound of DS albums with a lot of compression.
But does that mean that his Komet or Tone King amps sound bad? Of course not.
I don't like the sound David Gilmour created with his Black Strat and his amps on the last tour. I prefer his red Strat with EMG pickups soundwise.
That doesn't mean his equipment is bad - it is just another sound you like or dislike.
I'm sad that his guitar playing has suffered a lot over the last years - comparing 2019 with 2005 live concerts for example makes me cringe - but this nothing to do with the Kemper amps.
BTW:
Just listen to that sound in the video:
It is the great Anto Drennan with a Boss Katana amp which is basically a practice amp. Does that sound bad? I don't think so.