what i cant see your problem, if you don't like mixing armor just use full set armor and stick whit that and let al other players have the possibility to combo the of armor parts we think is fun to have ...
and as i told you b4 nothing in game tech is in the way to do so ... after all its a single play game so it doesn't affect anyone ells of you decide to run around as a fruit- salad!
The more armor combinations there are the more things the game has to load, that means fewer NPC's on screen, that's why they cut back on the amount of armors variations for Skyrim, so that it could include more NPC's on screen and so that armor pieces wouldn't clip through each other.
So, do you want to have more NPC's on screen and armors actually looking good? Or do you want less NPC's just so you can have armors that clip through each other?
Everything comes at a price.
They do X then Y happens.
They focus too much on dungeons and we get [censored] writing and quest designs. (Skyrim)
They focus too much on storylines and we get a bland gameworld. (New Vegas)
I for one want more NPC's on screen, nothing is gained by being able to mix armor pieces except for more customization options, and sacrificing gameplay for the sake of looking like fashion victim is not something I'm willing to agree with it, ever.