One that I’d like to see is a more in-depth sorting option for posts (allowing you to see for example top of December 2020, or top of a specific day). A custom date range selection would be best. I remember this being a frequently requested feature in the early days of reddit, and they never implemented it.
Yes, this is actually a super important feature. Extremely useful for communities like AskEurope. You’d have to state your country every time you answered a question were it not for country flairs.