using a 5400rpm Hard Drive nowadays is in my opinion, ridiculous. 7200 would have been THE minimum, and customers should be able to have either an authorized retailer replace the drive for them with an SSD of their choice or allow customers to change it out for an SSD.
This single upgrade would improve speed across the console on all fronts, I can't understand how this was overlooked. Also even if USB3 drive support is enabled, what happens if the main system drive fails? Can the external drive be used in it's place? I'm betting no.
It's 2013, going onto 2014. This shouldn't be an issue to replace with a faster drive. I love my Xbox One, but I strongly believe Sony had a better idea for hard drive replacements this time around. I understand that a swappable hard drive would cause issues with cable companies for DVR capabilities but that's not the customer's fault, you just need to make a better encryption system.