I've managed to endure in "hired gun" mode. But I seem to be wired for spontaneity & variety like that... YMMV.
Bands almost by definition are a pain in the butt.
(Yes, I seem to be in reminiscence mode today.) - I'm not sure if I remember correctly (after nearly 50 years), but I think that I gave up on even wanting to be a professional musician after attending a Fats Domino concert. I had this thought: "... and in many years from now, at every gig around 10:30pm, I shall be performing [my equivalent of] "Blueberry Hill". Is that what I want?"
Hmm... I must nuance the above. I have joined (and later rejoined) a trad. jazz band (at least the second time on bass!), but even there I lacked the "spontaneity & variety". I'd attribute that to the characters of the members, with to each applying:
"doesn't mind if he doesn't make the scene:
he's got a daytime job he's doing alright."
[the Dire Straits: "Sultans of Swing"]
A beauty of jazz [matter of opinion] is that replacing one member of a group (even jam set) is likely to alter the inspiration considerably. Or even changing roles. I started a rock group with a friend from the jazz sessions. He brought in a friend from his folk trio, I brought in a friend who happened to have a drum kit at his parents' home. So we had our roles per song:
Chris: bass (guitar with bass pedal), rhythm guitar, vocals;
Arjen: rhythm guitar, solo guitar, bass (my pedal), vocals, trombone;
Erik: solo guitar, rhythm guitar, background vocals;
Carlo: drums.
Imagine "Suzie Q" in the CCR version, but with the riff on trombone!
[deleted: the "why we split" matter]