I deleted my Reddit account after only a few months because it was an attention sink that returned little value to me over time, but (anecdotally) I still find the site extremely useful as a repository of the aggregated knowledge of groups of people with specific interests.
Example: Today I wanted to do a little simple video editing, and I tried three different commonly recommended free video editing software tools. For various reasons none worked, and I didn’t like the interfaces anyway.
A Google search took me to a page on /r/Filmmakers with two free filmmaker-oriented software options, and the one I tried (HitFilm Express) worked instantly. I may still try something else, but this instantly relieved some frustration and let me get to work on the project I actually cared about rather than continuing to try unfamiliar programs all day.
This fulfills one of the central promises of the Internet: facilitating the aggregation of knowledge from people or groups who really have that knowledge, so that people can learn and do more than we could before. I don’t need a Reddit account anymore (though I would happily create another one and just not subscribe to any subreddits if they, e.g., made pages members-only), but for all their problems I’m glad such sites exist.