I have met a lot of purists like the ones you mention and almost all of them have respect for the lore and setting limitations.
Hence: If you're that type of purist, then just don't wear boots/armor/helmet If you're argonian/khajit.
If you want to preserve the lore of the game world or whatever = problem solved.
But that doesn't mean you have to force those same strict limitations on others.
ie: What if I want to create an argonian dragonslayer who wears the scale and bones of his victims for his armor.
Why would the game prevent me from doing that just to please some purist?