[Kaderin Triste]

Which, kind of again, brings up the whole "teams are pretty much meaningless, so why not get rid of them?" question.
I mean, there's the whole possible argument of "to make it more fair so a certain people can't take all the gyms all the time and everyone has a chance to be on a gym" but in that case, just put a cap of like only 2 or 3 pokemon on gyms at any given time and call it good.

I mean, yeah, the previous team situation was very unbalanced and it could suck if you had joined Instinct instead of Mystic or Valor, but it actually encouraged people to work WITH their team. And, while they didn't last long, I saw, fairly regularly, higher level members working with new members to try to get them on gyms.
Now, unless you're a mega-newbie, you can pretty much handle gyms solo. No teamwork required.