I think my first comment didn't go through so I would try again just in case.
Great and welcome changes, team! I think this is an important step for us to completely change and evolve as a community. I just have a couple of points that you may have already considered but I would like to raise anyway.
Word count
I know that many people like to write their posts in 2 or sometimes even more languages and, because the same amount of text is replicated twice or more times on the same post, it's fairly easy in those cases to reach the minimum threshold of 750 words with a short text of 400 words or less. Don't get me wrong, I'm not saying that people do it intentionally to inflate their word count but it's something that happens and could skew the metrics for the new curation criteria. I don't know if there is an easy solution to this but I hope so :)
Tags
A lot of people use all 10 tags supported by most frontends exclusively to farm tokens. That adds literally no value in terms of content discovery and the promotion of Hive outside its walls. I understand the importance of community and tribe tags, but do we really need to have 10 of them in a post? I think it would be nice to have a minimum of 3, or even 5 tags to actually describe what the post is about.
With that being said, I would like to reiterate that I'm really happy about these changes so good job everyone!