What does that do? If you can do just as much damage at level 50, that you can at level 81, then what is making the enemies higher levels going to accomplish? I guess I just don't understand. So I'll just leave it at this.

This is where I am getting lost. How exactly are you becoming this great "overpowered" being. I mean any more so than any other character.
Take a Mage at 50.
Take a Warrior at 50.
Take an Assassin at 50.
Now take a maxed out player at 81, with the skills of all three.
How is he doing any more damage than any one of the three that capped themselves at 50 by specializing?
I am just using level 50 as a general. We know that some are 45 and some are 60. That is not the point.
Because of how Skyrim is constructed, even at level 30 - 40 I can make weapons that can rip apart level 50 monsters thanks to Enchanting, Smithing and Alchemy.
While my damage doesn't go up, my Health can, which means I can survive longer. If I was already destroying monsters because of my equipment at level 30 - 40, gaining all that extra Health isn't exactly going to make me any easier to kill when I'm level 70 or 80, even if I dump all that level 50 - 81 points into Magicka I'm still a freaking god.
You start putting enemies at level 50 - 81 who have more Armor, more Magic Resist, more damage, etc, etc... well now you have a challenge on your hands.
Senor the simple idea is this: either lock the door or put something in the room to interact with, just don't leave it empty. Giving us the means to go to 81 with no challenge is leaving the room completely devoid of content. If everything stops at 50 then lock the door on the player in the first place.
Again, it's a false sense of incentive to present the player with a "high score" that is ultimately meaningless.
Or looking at it from the other direction, if you put the target at 81, then some fraction of players will claim they feel "forced" to break their RP/character concept/whatever because the game expects you to get to 81/max all skills (and clearly, the game must expect it, since there are targets/achievements/etc up that high). And maxing out everything just doesn't seem to be the developer's intent (even though they allow you to do it if you want.)
There's a simple way to deal with that: Nothing important to the "main" quests or guilds, the attention getters, would ever be at a certain level. Final Fantasy does this all the time. The main quest villains can be defeated at level 50 - 60ish, however there are some special enemies that require you to be beyond 60 to deal with but they are never part of the "main" game. Alduin, for instance, should never be set at level 81 because some players never want to go past 50. Alduin also should not be set at level 50 because some players want to go past 50. He should be scaled to the player, always, no matter what level the player is. Other monsters can easily do the same. Hell, you could set it so that
no monsters are past 50 unless the player is past 50 so that players never feel like they have to go past a certain point if they do not wish to.
(And this is believeable, because there's already people complaining that the game "forces" them to break their characterizations by having the MQ drag you through the intros of the Mage & Thieves' guilds. Heck, there's people complaining that the game makes them break their characterizations by making them be the dragonborn/the game's hero/giving the game a plot at all.)
Yes, and those people (I feel) have no place talking about what should and should not happen in video game RPGs. Not being the Dragonborn is fine in PnP RPGs but for video games you have to set a structure down, period.