Stayed up late reading about the Hasidic community, these tightly knit passionately religious groups existing in urban technological modernity are so interesting to me for thinking about the future of religion in modern society, although they are perhaps exceptional

If they are an exception, then studying them is even more valuable for it to be ‘an exception that proves the rule’. Amish are interesting too, but I can see the rural lifestyle facilitating such traditions. Hasidic groups certainly do very actively manage keeping community...

together in cosmopolitan conditions. And some stay very cloistered their whole lives. But others go into fairly high paying white collar jobs where they interact w modern world and help to support the others (even the others just doing scholarship).

That last bit is very interesting, for several years into adulthood, and for some their whole lives, they spend time in cloistered scholarly communities studying religion and being funded by donations from the community at large as I understand it.

The leadership structure and sect nature within this group is also interesting. Independent sects are headed by hereditary leaders, who initially were charismatic religious leaders. Their authority seems to have been institutionalized in dynasties.

https://en.m.wikipedia.org/wiki/Rebbe 

But they are still expected to be very wise. The authority seems to extend broadly across the whole community, although obviously a very strong sense of religious law governs them too. There is a whole set of parallel institutions including charities enabling their lifestyles.