You'd change your opinion if you had your next 10+ encounters all result in a thorough [censored] whoomping. 1 strike and you fall. No inclination that the enemy that looked easy to slay was +30 levels above you. As I stated, if a +2 level monster still provides a massive challenge, but has less chance of insta-killing you like a +20 level monster would, then you'd still have the dangers of exploration. Things like enemy armour and loot could (should?) be scaled independent of the enemy HP and power, IMO.
There are so many ways to make sure the player doesn't constantly run into enemies 20 levels above his own level.
First of all you need to make sure that higher level enemies are farther away from civilization than lower level enemies. This is pretty obvious. If the area around a city would be populated by a horde of level 30 Daedra the city wouldn't exist. The player needs a bit of common sense to choose where he wants to go. If a level 1 character chooses to explore the most remote mountain regions of Skyrim then let him do it. And watch him die.
Secondly you can easily see how tough an enemy is in most cases. Big enemies like ogres, minotaurs etc are obviously more dangerous than small enemies like rats or mud crabs. Three marauders wearing orcish armor are more dangerous than a single bandit wearing fur armor.
Thirdly you always have the chance to run away if you are prepared. Either by using potions, spells or other means.
Finally it is sometimes nice if you actually die. It makes the game challenging. What is the point of all the gameplay mechanics, all the spells, all the weapons, armors etc if you're not going to die anyway because everything is more or less at your level? Dying should be part of the game's concept, as much as Pete Hines and his target audience may hate it.
Mods in Oblivion implemented static levels for enemies and the majority of mod users makes use of them without problems. It works and it has worked in other RPG as well.
Two levels above the player's level is not much, you won't even notice it. It's the same thing Oblivion did (not all enemies were exactly the same level as the player had, it was the same system as described in the OP). The game is laid out for a max level of 50, so two levels won't make a difference.