I have this fantasy where the map is now the sky, sea level/island level, and then sub-sea level and you not only sail, but dive. There should be lots need for both swimming/diving and underwater iron-boots usage.
I would love for there to be a “classic sailing” and “new sailing” modes where you could choose to have just “grab and go” transport over the sea, or you can get a little more immersive with the sailing mechanism. (Although if we had the ability to change wind direction again, that could quickly make it real boring. Because you’ll always want to make it a direct downwind heading and you won’t need to adjust sails or anything once you do it.)
Share your other ideas!