I find Reddit very useful for some sorts of topics, especially ones where technical and pragmatic opinions and experiences are more relevant than hard facts. For example, topics related to gaffer/grip work.
In fact, sometimes, this is the only place where there seems to be info (opinions and discussions).
A very similar case applies to websites like Quora. Surprisingly, sometimes there are absolutely excellent answers there from pertinent professionals (my experience was with Physics topics). There is often a mix of answers, from really bad, to ok, to really insightful. Perhaps AI should NOT pick an answer or weigh at all, but simply point to the discussion if it seems interesting enough.
Reddit is also good for news about disappearing websites/contents, historic issues (in hindsight), etc, particularly on fan and topic pages.
Personally, I do not use Reddit much. But my experience with Google has shown that it is an invaluable resource in topics like Amateur Radio, Grip & Gaffer work, product and service fan discussions (eg: fitness programs), etc.
I generally find these useful for different kinds of info: StackExchange network (programming & dev stuff), Reddit (technician, hobbyist/amateur, and DIY stuff), Quora (Engineering & Physics), specialized forums (for specialized topics like audiophiles, telecine, running Windows 7 these days 😊, etc).