I've had opportunity to live with and become a part of two different branches of my family at different points in my life.
One side of the family was somewhat dysfunctional, and more importantly didn't suit my personality, interests, and to some extent my worldview. While it did have some of the positives I'll mention below, overall, being part of this family felt like a minor thorn on my side. Like having an annoying neighbour.
The other side of the family was much more functional (existing members were well-connected together), and suited me much better too (so the potential for me to form a new connection was strong too). And I realized how comforting such connections are, how much mental stability they give you. The "being part of a whole" experience was significant and strong: when any of you did well, the collective-you was doing well, and so you wanted it like your brain wants your legs to do well; when any one of you had a problem, it was automatically something for everyone to try and chip in to fix (in a way qualitatively different from most friendships).
But to make this work, there needs to be constant honest communication between the members (which can feel like people poking their nose into your business when you're not getting the benefits from it), and you have to be willing to imbibe some of the shared culture of the community (so that, for eg., there's some agreement on what's good/bad for the community). The second part can be particularly difficult for children of immigrants trying to assimilate into a larger family (who are often the ones that get to experience this family-oriented lifestyle as a new thing), as there's not only the usual generational cultural difference, but also the larger fundamental cultural difference between the traditions of different parts of the world.