So I propose this system.
Not only let us become proficient with light and heavy armor but let us get better with certain armor sets. So let me take fur armor and become more proficient with fur armor so that it extends it's usefulness. Still make it weaker than better quality armors but let a very proficient iron armor be 1 or 2 steps better than a non-proficient steel armor. This will let me keep the look I want for my character and extend it's usefullness.
Also only make 3 complete sets of deadric armor in the game