I'm one of those people. I'm told the problem is mainly that I can't find the right subreddits to follow; any remotely popular subreddit is a) very easy to find, and b) almost completely worthless. It's really the same problem that this entire HN thread is about!
I've found that single-player games often have shockingly nice communities on Reddit.
r/EnterTheGungeon and r/AceCombat were two great ones. I say "were" only because they (naturally) become sort of semi-dormant because those games haven't seen major releases in a while, so discussion has petered out. r/Xcom is pretty strong!
It's hit or miss, but a lot of "niche" hobbies have really good subreddits. I recently got into watches and subreddits like r/Casio and r/Seiko are fun and supportive. Not exactly deep discussion, because there's only so much you can say about a watch, but they are fun.
There are some decent audio-related subreddits. I'm a mod at r/budgetaudiophile and we try to be as helpful as possible who are dipping their toes into the hobby, though I'm not too active over there these days.
I haven't found any solid tech-related subreddits, ever. Though, I haven't looked too hard I suppose.
