Some of these require changing what the STEEM system is about. Having a referral system and daily rewards will have to remove from the rewards poll and I think leaving it all to curators and authors is better.

I like your suggestion of having "Why did you downvote" button.

They are already taking Steemians feedback on hardforks, they make posts for them but they're just too technical and needs a lot of learning to understand them. Also, a hardfork isn't implemented until the majority of top witnesses agree to it (as far I know, I might be wrong.)