People used to add "reddit" at the end of their search queries, and now I'm sure many of those people just ask a bot. But reddit is still there (even if in the form of a grotesque mutation of itself) because people like to talk to each other.
So yeah, AI surely didn't help, and I concede that the SO case is even worse given its nature (and how good of a substitute AI is), but if it wasn't a pool of acid I could see it existing as a place for people who want human help and opinions. So I don't think it's fair to say the drop is "100% because of AI", as you put it.
Then again, it's been a pool of acid since forever and it kept going for a long time like that, so maybe you are both right. AI did kill it, but because it was hostile.
To me your description is mythical reddit. Actual Reddit is every bit as hostile as stack overflow and unlike stack overflow, old questions can not be updated with new answers when existing answers get out of date.
But SO was never a place to just talk to others. It's not a general purpose discussion site. It could have been a friendly place, but users still would have left, because it's just far easier to get an immediate answer from AI, and those answers have only been getting better.
Yeah, the place could be very hostile, but that hostility didn't crater questions before ChatGPT was released.
> But reddit is still there (even if in the form of a grotesque mutation of itself) because people like to talk to each other.
I hear they're drowning in AI bots. I guess a fair amount of people also don't mind talking to those.
But SO was never intended to be a place where people "talk to each other". It was specifically intended and designed (sort of; the design was faulty) to avoid chatter because that gets in the way of others coming by later and finding a question and reading its answer.