Yeah there should have been versions of armors like the Thieves Guild and Dark Brotherhood armors that aren't pre-enchanted.
I like the looks of them, but the enchantments make them largely unappealing to me. I could do better enchantments with 100 of the skill and a grand soul gem.
I'd like them to be unenchanted not because I want to put different enchantments on them, but because (i) I might like the look of them, and (ii) I prefer playing without any enchantments at all (whether I've created them or not).