I'm sorry but reddit is trash. Every subreddit, no matter how niche, is basically cringy phrases being repeated or photos of some "home set up" or said niche product someone bought who is looking for validation of their decision. It's so bad I blocked reddit from my search engine results.
Clearly we're using different subs. ymmv.
Provide an example of a sub that isn't like that?
Both /r/Science and /r/AskScience are very heavily moderated and verified industry experts discuss papers on it.
There's a lot of interesting discussions on r/science but like the rest of reddit it's such an echo chamber that you end up with bizarre one-sided arguments that discourage all opposing views.
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/r/CreaturesGames/ - Discussion about the Creatures artificial life simulation games. I haven't seen anything particularly cringey on it.