Pros
The Band is always ready to rehearse.
The Band always plays what they are supposed to.
Nobody drags or pushes the tempo.
I can add or subtract players quickly.
Small gig footprint opens up more venues for certain players
All the $$$ go to you.

Cons
Making quality backing tracks is HARD work.
You can't purchase many useful ones.
Rehearsing the band is hard work. Lots of heads and solos to learn
You need more tracks per unit time than a live jazz band at a gig.
You need quality gear to make it sound like a real unit.

Certainly others can add more in both columns.

All in all, they work for me. I get some gigs using them.
Making and rehearsing the tracks keeps my brain stimulated

I still have some time to play live with other musicians.

biab2023(Mac)
Logic Pro X