I still get the occasional popup, but now they're limited almost exclusively to newly installed apps that I'm running for the first time. That's still an eye-opener: no, I don't see a need for a calculator to connect to Google Analytics. Deny!
Except for gamed, of course. There's no rhyme nor reason to which hosts and ports it wants to talk to. If you ever want to hack a Mac running Little Snitch, call your process "gamed" and the own will allow it through (if they haven't already set "allow connections to any host and port because alert fatigue lol").
One possible way to do this well would be displaying information about how many people blocked/allowed. Then maybe following the crowd if it is converged enough, e.g. ≥1k votes with ≥95% same decision. But, this might be technically and socially challenging (people who care about this level of privacy may not want to share their rules; you need to make sure that no malware developer can game the system; people need to trust in that).