Answers from 2013 likely no longer reflect the currently accepted ways to do things, even for technologies which existed in 2013 and earlier. What you describe is a problem they created on their own with their ridiculous duplicates policy which ignored the fact that the world keeps changing.
Well, a combination of that and understanding human psychology. For any of these common issues, SO usually had an answer of what you were supposed to do, but it was usually very counterintuitive.
yep! 90% of the time if i have a question about a project there's a discussions tab that can take my question with a nearly identical interface to stack overflow's, and I can be reasonably sure there will be contributors or maintainers who will see it. Not much point to stack overflow as a second, silo'd site in that world
I think other helpful places like reddit, discord, web forums etc might be what hit SO 2014-15 onwards.
AI seems to have given it a blow of mercy to end the misery.