One problem is, that everybody has a different idea of what quality means. Quality for user A is a sleeping pill for user B.
And the other problem is - rewards are by far not only depending on quality. As a long time user you will know what I'm talking about. All the time - also the time when it still was Steemit - we are struggling with nepotism or outright fraud and con artists.
I guess the biggest problem for Hive is what makes it unique (well almost unique) - the reward system. Without the financial aspect all that wouldn't even happen at all. And most people wouldn't be here, I guess, quality content or not.