There are many, many places in the game that I would like to get to.
Needing to get there is wholly beside the point.
I want to stand on the roofs of any of the cities for instance, to admire the view.
Especially Solitude has some nice rooftops that I would love to get to, because they are there.
Actually, the need to get there is the whole point.
Skills, at least as the developers have made them in this game, seem to be focused around a practical end. If the only reason for a skill would be so that you could jump on top of everything you see, then it doesn't really serve a practical purpose (it may serve a practice porpoise, though, depending on their taste in games).
As for the realism debate, I think that people are couching it in the wrong terms. Yes, this game involves magic. Yes, there are dragons. No one is claiming that the game is designed around a realistic world. However, the aesthetic feel of the world does create an established sense of physics that is realistic
within the fantastical setting of the world. So it's not out of line to say that allowing people to leap 15 feet in the air feels unrealistic, because that's referring to the realism within the context of the game engine.