You didn't list movement in the poll, so I selected other. I don't like the current movement system and saw nothing wrong with the Civ V system. Bluntly, I want to go back to the Civ V movement system, but even more than that, I want Scouts to ignore terrain penalties. Horsemen are better scouts than scouts in Civ VI. Yes, the first two promotions help scouts a bit, but they're still stopped dead at every river. The fun of exploration has taken a major hit with scouts obeying all terrain penalties.
Also, I really don't like the current promotions system. While a handful of individual promotions are okay, there are many that are not particularly useful. I seriously miss the Civ V promotions.
Hopefully a MOD will appear to rid scouts of terrain penalties. I imagine changing all the promotions, if possible, would involve a lot more work.