Your first point definately sounds plausible. Another theory I have is that my perception of good results changed over time. It could be that for the first tim

Your first point definately sounds plausible. Another theory I have is that my perception of good results changed over time. It could be that for the first time in my life I know enough about the domains I'm looking up that I can differentiate the good from the bad. On the other hand even with that, when I enter a new domain, e.g. AI it still feels "less discoverable", even though there are definately good introductions out there that you can find when going beyond Google.