I actually used to rely on that, using site:reddit.com for most searches. Reddit had some of the best in-depth discussion and tech advice I could find. Compared to the multitudes of blogs, YT videos, and decades-old forum posts that normally came up, reddit usually provided useful info. And it's pretty much the only reason I'm ever on the site now: the only results for some searches are on reddit.
Eventually if the quality of the posts decline, their SEO presence probably will as well. But google has been absolute dogshit for about a year now so who knows what that field will look like in another year. =/