I had a good friend with a band. They were pretty good and people sat and enjoyed it. Their regular drummer was not available for a few gigs. We got our friend Juan to play.
When Juan was on the drums, people were jumping. Everyone up dancing. Same songs, same beat, but Juan had impeccable timing and knew when to sit back and when to drive the beat. The whole band locked in and sounded tighter. I could never get that using computers, but oh well, it's all i had.