Yes, the variety is certainly an issue. I do miss certain communities on Reddit.
It's not to the point where I'd recommend it to my wife (she's the opposite of a techy Linux weirdo), but it works for what I wanted Reddit for, which was tech news aggregation and a place to discuss games.
Maybe I'll get around to trying to start some of the other niche communities I miss.
That said, you would probably have luck discussing tabletop gaming on one of the gaming communities here. I personally don't play any (I've played one DND campaign and decided it wasn't for me, open to trying again though), but I have coworkers who do, so maybe that'll change.
That said, here are two that I really like here that I was surprised to find here that aren't Linux or tech related:
- !bicycling@lemmy.ca
- !patientgamers@sh.itjust.works - are video games "techy"
But relatively niche things like musicals aren't really a thing here, though I never felt much of a need to look for stuff like that. When I want to watch a play or musical, I generally look for expert reviews.
I do miss some subreddits for recommendations (especially "Buy it for Life" and related purchasing communities), but that's usually a read-only thing for me so I just check back on Reddit as needed.