It does replace the "lazy" part of StackOverflow but not the most valuable part of it. The lazy part is just responses to people that failed to find the manual

It does replace the "lazy" part of StackOverflow but not the most valuable part of it. The lazy part is just responses to people that failed to find the manual and/or read it properly, and the responses just quote the docs back to them or show them how to apply the docs to a pretty straightforward examples. And this LLMs can do very well - and I don't mean to discount this, finding some corner case in the manuals can be very annoying and time-consuming endeavor, and LLM can save hours here. But: any task that is minimally novel and non-trivial gets it completely stumped and it starts spewing pure nonsense. And plausibly looking nonsense at that, which is even worse - like construct the code that seemingly works except couple of key functions don't actually exist - LLM just hallucinated them because if they existed that how it'd work. Happened to me more times than I want to count. That's where SO is valuable because - occasionally - it is answered by people that actually understand what is going on and don't just regurgitate pre-digested information. Unfortunately, that's what LLMs are still largely incapable of. As regurgitators, they are probably the best tool out there. But beyond that - you'll still need to talk to somebody who understands.