Then you need better levels for enemies based on region, character milestones, and better choosing what enemies scale with the player and which don't.
I know what you are getting at. You want tougher enemies as in ones that have more abilities and the such so they can be more of a "Think Right and Win Easily but Think Wrong and Lose Easily.".. This will be hard to do because there are no scripts, as I know, that can read the player's armor rating, perks, and other such stuff. Thus, it is impossible for the game to know what you actually have. That is why it is set on your level cause that can be calc'd and easily set your enemies to that level with w/e health, fatigue, and magicka.
Now, if Bethesda updated their scripts so they can calc what perks you have, your resistance to damage, etc then give your foes other perks to combat that those stuff then yes, I can easily see this happening but currently, there is no such scripts that can do so and I don't think it is even possible. The only way to give enemies special abilities is to let them have such things at the start of the game which can cause a lot of issues when it comes to having combat.
So we are kinda stuck at just making our foes have higher combat level, more health, and such. Personally, I don't mind this and I would wish that Bethesda could've made the level system from 1 to 80 instead of 1 to 50. Would give us a lot more harder enemies to fight, that's for sure.