I'm about a decade behind you experience-wise, but I can tell you that I've seen #4 a few times. What's interesting is that in each case I can say it didn't fe

I'm about a decade behind you experience-wise, but I can tell you that I've seen #4 a few times. What's interesting is that in each case I can say it didn't feel like #4 was happening until I looked at the experience in retrospect. It's almost like had we of been mindful or trying to achieve that, we would have been too self-conscious of ourselves to have actually succeeded. It was also a more broad cultural trait, it was a team that collaborated together well (sometimes kinda large teams, too). And most of the time there was a key leader or two that seemed to be key in bringing out that quality in the team. I can also say that many of those teams still keep in touch, even if loosely, in some cases (now) decades later.