I believe you don't mean to be rude, but you just sound completely naive to me. To think that documentation includes everything is just, like, have you actually been coding anything at all that goes just slightly off the happy path? Example from yesterday: I have a modular JavaFX application (i.e. it uses Java JMS modules, not just Maven/Gradle modules). I introduced a call to `url()` in JavaFX CSS. That works when running using the classpath, but not when using the module path. I spent half an hour reading docs to see what they say about modular applications. They didn't mention anything at all. Specially because in my case, I was not just doing `getClass().getResource`... I was using the CSS directive to load a resource from the jar. This is exactly when I would likely go on SO and ask if anyone had seen this before. It used to be highly likely someone who's an expert on JavaFX would see and answer my question, sometimes even people who directly worked on JavaFX!

StackOverflow was not really meant for juniors, as juniors usually can indeed find answers on documentation, normally. It was, like ExpertsExchange before it, a place for veterans to exchange tribal knowledge like this. If you think only juniors use SO, you seem to have arrived at the scene just yesterday and just don't know what you're talking about.