I think I can probably guess the answer and it being something along the lines of the Hyrule Castle event not activating without going through all the stuff on the Plateau but what's the reason that the Fall Damage Cancellation isn't used to skip the Plateau? I doubt it would be because of the need for the moves being added to the Sheikah Slate just because even though you need extra weapons/food from inside Hyrule Castle you could surely go a different route that isn't slower than doing all the Plateau Shrines to get what you need before fighting Ganon. What is the reason?
Until you get the paraglider there is a death void thing all the way along the map. If you try and leave early you get warped back. It's not fall damage, just the game damages you and warps you back.
