I have a looper...but I bought it specifically for one task: I use it when finding the best mic position for a guitar/amp/speaker combo.
The video - yes, he has smooth chops and he's dexterous when it comes to setting up his parts but it's a long, mellow jam to me.
I can see how a looper would not be the best tool if you want to record a song with several different parts.
Even with using it for practice your DAW can loop.
I guess it's designed for one man live shows.
At a "live" show I find them annoying.
99% of looping performers seem about the same to me.
2-3 minutes to assemble 4or5 2-4 bar tracks that never vary.
Then somebody doing something slightly less monotonous over it.
Until mercifully, it stops.
I usually leave before they get to whatever it is they are getting to.
Then they do it all over again in a different, key, tempo, groove.
Who cares?
Not me.
On the other hand
As a guitar player, a looper is a valuable practice tool.
Learning a tough part in a song?
Loop a few bars of the changes and beat on it till its right.
Move on the the next section.
Admittedly you can do it with apps like Transcribe, but a looper is pretty quick and dirty.
Overall, I think the world would be a better place without them.