Yeah, it makes me curious about exactly what thinking was involved in the site going to heck like that. Part of it was questions and answers accumulating and so the question of duplicates thus apparently weighing on the moderators minds more. Part of it might have been an effort to prevent people gaming the system.
Actually, talking to ChatGpt, I found this article: “Stack Overflow Isn’t Very Welcoming. It’s Time for That to Change.” ( https://stackoverflow.blog/2018/04/26/stack-overflow-isnt-ve...) and that actually shows what the SO admins didn't get (imo obviously).
They thought the problem was people not being nice. But that actual problem was that SO was "gamified" and it's gamified interface made it impossible to win unless someone was ultra-competitive (and I'd those types burned-out over time as well). People not being nice was real but it was side-effect of the situation (questions answered instantly so a would-be question answered had to be constantly racing).
It's easy to imagine how the admins didn't see the situation. Each up of intensity seemed to up the engagement and so seemed a good thing. The question of whether the process was sustainable didn't appear and when there were problems it was attributed to something else.
I think