This is why we need jumping/falling system in FFXIV

[Ilean]

But. It. Makes. You. Look. Really. Really. Really. Really. Dumb. L. O. L. !.

I'll leave this here:

Jumping. Does. Not. Add. Immersion. To. A. Game. Not. Designed. To. Be. Explored. Via. Jumping.

If there are caves or tunnels or dungeons we already progress through more layers than just the "x plane". Adding jump won't instantly open up a brand new world. Even in Mario games there's limitations to where you can explore.