I haven't really studied the details of HF.20 yet; I also still don't understand exactly how "communities" are going to be implemented.
After a "short week" I have decided I like the new voting power balance. It offers a wider scale of rewards... I can give something truly outstanding a 100% upvote and otherwise dial it back to around 20-25%, which would be pretty equivalent to voting, pre-HF.19-- at least as I understand it. What I do find is that I have to seriously ration myself on upvoting comments, or my voting power drops right off in no time. And since I like to manually read, comment and curate a lot of content I have to be super careful... my voting power is just now coming back into the 80% ish area after a couple of days of using it very sparingly.
Yes, steem.supply is a pretty cool app, especially now that Dragos has it working properly.