Your assuming said loot wouldn't be guarded by several extremely badass enemies that only advanced (lvl30 +) characters could hope to contend with. This is the way the game SHOULD be. High risk, high reward.
I may wander into a place at level 5 and get omgwtfpwned! by something 1000x stronger then me, but then I'd just say to myself... What is that thing guarding?
Now when I come back at level 22 with much better equipment and can actually stand a fighting chance things are going to be very interesting indeed no?
As for multiple enchantment versions of the same armor... They could just make it so that with the enchanting skill you can gain a perk to remove and re-adjust existing enchantments.