People like basketball players can jump significantly higher than an average Joe, and after years of jumping around, you should at least be capable of jumping higher even just for a bit.
A traditional tribal coming of age rite in a province in Indonesia (I forgot, around North Sumatra or Riau) involves jumping past a tall block of stone, and it can be up to 2 meters high (or even higher), all this just for coming of age.
Those who said the default jumping height in Skyrim seriously underestimated the capabilities of human being, and perhaps believe that when you shoot a big cannon ball through a human a round shaped hole is the result (hint: it's not, the result is heavy injury and a few years in jail sentence)

), with no gear, and landing flat on your back. So with armor, tons of weapons and dungeon loot, landing on your feet, it's perfect the way they programmed it.