For the same reasons Open Mike mentioned, I’ve loved being in a band and having the camaraderie, the letting go and being a part of the whole, the magic sauce …
I think I relate the feeling of being a part of a greater whole to being a key ingredient in the magic sauce.
Being a soloist, on the other hand, has its magic as well as has been mentioned. Especially when you have just the right collection of gear that is manageable yet offers great room for experimentation and growth. I feel grateful having the OT (and my associated pedals, bass, tanbur, etc), as it allows for this for me.
It’s give and take, soloists don’t have to deal with band squabbles, the guitarist doing meth before rehearsal, stressing when members don’t show, etc. But band members get a collaborative musical product (if that’s the band structure) and they get to rely on the strengths of other musicians. They don’t have to try to entertain an audience alone. I miss bands sometimes, yet having solo work to come back to will always be my panacea.
Edit: As @Ray-Ray_Velouria mentioned, it isn’t a versus thing with me either. I think at this point, my ideal would be myself and a vocalist, even though I’m singing more now. Duets are cool two people is a band, right?