Why? Do you know how much stuff I have that is just sheer crap that is out in storage in my shed? Behind a nice expensive Master Lock (the brand, not the level).
Sure, lets make level irrelevant. I want to see low level bandits carrying high level weapons and ancient dragons with iron daggers. I mean, it makes sense, right? Just because someone is weak doesn't mean they have weak weapons, and dragons likely wouldn't be swooping down and chomping on people with full sets of Daedric gear.
This is Skyrim, not real life. There should be an incentive to take on things that are generally harder to accomplish. That's how games work, after all.