Exactly this! This is my experience also. Your point about "well covered & non-controversial" is spot on. I know not to expect great results when asking about topics that have very little coverage. To be honest I wouldn't expect to go to an arbitrary human and get solid answers on a little covered topic, unless that person just happened to be topic expert. There is so much value in having the basics to intermediate levels of topics covered in a reliable way. That's where most of commercial activity occurs.