Over the past one and a half years, Stack Overflow has lost around 50% of its traffic. This decline is similarly reflected in site usage, with approximately a 50% decrease in the number of questions and answers, as well as the number of votes these posts receive.
The charts below show the usage represented by a moving average of 49 days.
What happened?
I think I see a core issue highlighted in your comment that seems like a common theme in this comment section.
At least from where I’m sitting, SO is not and has never been a place for learning, as in a substitute for novices learning by reading a book or documentation. In my 12-year experience with it, I’ve always seen it as a place for professionals and semi-professionals of various experience and overlap sharing answers typically not found in the manual, which speeds up the pace of investigations and work by filling eachother’s gaps. Not a place where people with plenty of time on their hands and/or knack for teaching go to teach novices. Of course there are those people there too but that’s been rare occurrence in my experience. And so if a person expects to get a nice lesson instead of a terse answer from someone with 5 minutes or less, those expectations will be perpetually broken. For me that terse answer is enough more often than not and its accuracy is infinitely more important than the attitude used to say it.
I expect a terse answer. I also am a professional. My experience with SO users is that they do not behave professionally. There’s not much more to it.