Honestly, would it kill for both sides to meet halfway on this?

A structured jump feature gives both sides what they want, more or less. You can't bunny hop all over the place and you can't try to get "out of bounds" but you'll still have your ability to scale/jump cliffs and fences. You walk up to a fence and you get a prompt to jump it. Tie that prompt to a key and boom, instant terrain jump. Same for cliffs. At least with a structured jump feature, animations can be adjusted for the varying sizes of the different races.

As far as swimming goes, I would actually be fairly happy if it was in FFX and had whole areas devoted to underwater segments. But not bobbing around in zones that don't actually have a use for it. A whole underwater dungeon would be cool, having to swim to it and do some "dry" areas of it.

The zones in 2.0 simply need to be designed for it, and I think it would be beneficial to both sides if it was prompt based instead of free hop.