Fully being unkillable should never ever in my opinion be added to a agme because it completely destroys everything the developers have done for the game. Such things include a 100% chameleon effect without AI enough to counter it and 100% resistance/reflection to something. Am I against chameleon? No I'm not, but at 100% it should not work as it did in OB, completely ruining the whole point of the game by making all enemies passive zombies doing nothing.
Again with the 100% chameleon
Then again I'll say "if you don't want it, don't use it".
What is the "whole point of the game"? I'll tell you: the whole point of the game is that you are going to play a role in a story, and you are going to have the freedom to choose how you play that role and how you influence that story. And that is what the developers do for the game: create an environment where you have a choice to play the game the way you want to play it. TES is not just about "combat", "boss fights", or "must fight-must kill everything".
As to the OP...
I play games like TES for the story. About halfway through a game, I prefer to be overpowered, since combat becomes repetitive, and to me, gets in the way of the story, so I want to finish fights as soon as possible, or just avoid it if I can.