I'm going to repost this as a response to meeting halfway (I'm pretty sure most will agree with me on these):

My vision for jump:

~Have it so that players can jump whenever they want/need, but make it realistic and in-tune with the current high quality animation style. This means a fairly instant jump upon button activation, but ending with a nice smooth landing animation which needs to finish its cycle before being able to spam it again. This would avoid what FFXI players fear the most in terms of incessant bunny hopping.

~Have jump actually coincide with the design of 2.0 so that there could be reasons to jump (i.e. in dungeons over pitfalls that could drop us a level below). Falling from heights too high would hurt our HP (like in Zelda), but cliffsides should still have invisible walls (no need to fall off cliffs since this would only be an instant death hassle).

~If jumping was to be implemented into battles (this one's for you Jynx), they shouldn't be regular jumps but instead dodging rolls in all directions.

~If/when swimming is added, let us climb (yes, climb) up ladders/vines to high ledges and swan dive into the water. This would be awesome as an entrance to an instanced dungeon.

~Allow us to jump while on chocoback, but let us glide down to the ground with certain (black) chocobos.