Let me break down why I think jumping is ridiculous.

First of all go through the entire Final Fantasy series. Do you see jumping in any of them? From what I recall no. That's first and foremost... the fact that this is a Final Fantasy game, and not just an MMO. Therefore, the "Final Fantasy feeling" is higher priority than the "MMO feeling".

Second of all, take a look at the world. All of it. The ledges, the layout (especially Limsa and Coerthas), everything. This game is not set up for jumping. To implement manual jumping and physics like in WoW they would have to redo half the game's physical structure. Do you have any idea how much time and money that would take? Say goodbye for future content coming out any time soon if they choose that route. The time spent implementing jumping could be better spent on more critical things.

Third of all, jumping does not add anything good to an MMO. Period. Nothing. Nadda. Zippo. It makes you look like a bunny rabbit, and with the races in this game (Roegadyn and Lalafell prime example) it would look ridiculous. I don't want to see Roegadyn hopping around like rabbits. I do not want to see Lalafell jumping six times their height.

Implementing a FFXIII-jumping feature is good enough for those pesky ledges and hills.

There's your input you desired.