For me the next big thing is Tribe.
I thought Tribe should have been in Mark's PB rules and thought it was weird when human connections weren't included in the list. I do understand why one might want to leave it out, though, because if you follow that topic too far down the rabbit hole it gets political and starts to undermine the myth of the nuclear family being the "natural" social structure of humans.
Anyway, I'll use my life as an example. Starts with a narcissistic father and a passive mother (from a long line of others like them and each generation getting progressively more isolated and mentally ill). The ONLY way I made it out was by the influence of elementary school teachers that gave a s**t. Fast-forward to my life now. Few family connections due to above and my husband and I decided not to have children for environmental reasons. So...I've had to fill my need for tribe/family with friends. I am making a greater effort to really search out people with similar worldviews and overlook trivial character "flaws" (that would have been deal-breakers in the past) in order to have many strong, trusting, human relationships. I crave time with children and also with other women. I think that's natural. Most women fill the first need by having children - but then I've witnessed many of my friends become isolated by the insane time requirements involved in both working and taking care of children. Tribe solves that problem.
It's a really difficult thing to do. This social system depends on competition between individuals and that leads to isolation. One of the things I've done is to stop comparing myself to other women. Women do this all the time and it's so counter-productive!
Anyway, there is a lot more to this but I thought I'd at least throw the idea out there.