A better way to manage blacklist would be great. An interface like open DNS where one could select what to block based on category. Ads, porn, political, foreign, social, etc...
Pihole doesn't maintain any adlists. It includes a few lists by default to make it easier to beginners to use pihole.
You're free to add lists of any source for any purpose (porn, social,..) you want.
With v5.0 you can enable/disable each list separately, add a comments (e.g. category description) and group them for fine-grain client assignment.