I think it is inevitable that there will be topic overlap. I'm sure someone with more spatial intelligence and ability than me could diagram the overlaps in an interesting way.
For me, the "happy cluster" is an intersecting of Utility with Classic & Vintage with a smattering of SSFG, Alt Bikes, and Recreational & Family. There are also some nice Women's Forum threads, but they're all about decor, and so I'm sure you guys wouldn't be interested.
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