Well, in jazz, you have your own individual style, people hire you because they like it. Sure, in different settings you adapt, but you still sound like yourself. It's the same with classical soloists. The ones that are famous, are famous because they don't sound like anyone else. Just a lot like themselves. Same with singers (rock, jazz, classical) - all well-known singers are very recognisable, and a lot of them have weird, unusual voices.

Also, I find it strange, this talking as if programming and music don't exist in the world outside a setting of just having to do what the leader wants. I guess particularly because I've been programming and playing music all my life, almost all of the time doing exactly what I wanted every second. (Only music professionally)