The metal is oddly cool against our feet.
When Betty the Beagle walks down our stairs it sounds like a herd of beagles are slowly making their way down some steep metallic hill. Our interior stairway was actually designed for outdoor use; it's made of metal and I bet it could withstand the elements better than our non-weatherproofed wooden front porch. As a result unless you have feet sans any sort of claw (read: GalPal or Tankboy) you're going to make a ruckus. Heck, even the cats make a healthy amount of noise running up and down those stairs and they're supposed to be all lithe and quiet and shit, right?
Why would you put an outside stairway inside? I kind of like its quirkiness though I admit there has been once or twice where an unsteady step upward resulted in a bump that could've broken or at least split open a shin. I wouldn't recommend letting your kids using it as a jungle gym. But I like things that are slightly off so it suits me. The house we rent is old and has lots of little idiosyncrasies that I or GalPal would happily change or update, but our outdoor stairway that's inside is the one I'd probably just leave as-is.