Children, SO is a blessing for humanity. Their creators should be canonized. You don't remember the pre SO times. You couldn't find anything to fix your problems and must read the source code or pay zillions for some sh*tty support. In the pre-internet times, you just would hit a wall and have to quit. I really love Jeff and Joel.
Companies who developed libraries and frameworks had to do proper technical writing, otherwise people wouldn’t be able to use their technology. Microsoft did amazing job writing their MSDN, but others did well, too. Linux man pages, Java JDK docs, and similar sources contained more than enough information for a motivated reader to start using their tech, get stuff done, and be productive.
A bit later, many of the vendors created their own Q&A forums, in addition to writing documentation. Such forums are focused on a single tech, so web developers don’t come to game dev forums to close other people questions they don’t understand due to lack of background. Happens every day on modern SO.