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None of sankisei are my oshi. The only one I watch regularly is Marine. Despite that, I agree with OP and much of this thread: 3rd gen are all impressively successful as individuals, work well together, and seem like great friends. I think the 5th gen is similar, but to a lesser degree, and ENs feel like a separate beast altogether. Maybe Gamers is like 5th gen: also impressive, also great friends, but still not the same magnitude.
The Hololive Third Children is the closest that the industry has (yet) come to the platonic ideal of chuubas grouped together as a "generation".