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.

biab2023(Mac)
Logic Pro X