At a certain level of ability, everyone can perform the job. When we reach the level of professionalism, competence, and confidence, the ability to perform doesn’t necessarily set you apart from other potential players.
I have this conversation often with other musicians: “they’re a great player and they’re really great to hang with.” There are also a lot of great players who are not great to hang with.
I used to think the ‘hang’ didn’t matter as much as the playing. It seems to matter as much if not more; it’s the communication, the comradery, and the time outside of playing that helps players play better. When there can be drama in theatre, knowing each other and spending time together keeps the work relaxed and enjoyable.