Posting a question there has been pointless for years. I also dont think I've seen any answers there via duckduckgo useful to me in a long time. I dont think I'd even notice if it disappeared tomorrow. (I am not a web dev btw)
Isn't that mainly because it's already been answered? (Apart from new tags) I've got dozens of questions on my SO account, but it's been quite a while since I wrote one now.
High ranked mod/troll types, who seem to spend all day there trying to get more karma for some reason, constantly cruise for new questions. They dont know much about programming in general, and have zero knowledge of my specialist field for example. If they see a question that superficialy resembles or shares certain keywords with another one they will close it as being answered already (pretty much acting like particularly dumb bots) even if it has nothing to do with the existing question, or if the existing question is massively out of date and irrelevant because of updates to the software in question.
Some of my own questions followed that route, without being dupe questions and while being a code-based success or fail state. The closure of tickets is detrimental to the site, but somehow, it's still worth asking a question.
The picture was much different when I started out, and I feel like StackOverflow is still an invaluable resource for juniors/mid-levels or for those transitioning to an unfamiliar technology.