"uselessly expensive ports on the back" ?
The above is just a typical example of an uneducated user who doesn't understand the value of Thunderbold or USB-3.
You are absolutely correct, I don't understand the value of Thunderbolt. (However, I feel it is unfair to call me uneducated since I have listened to all of the endless, endless arguments for Thunderbolt and still don't see the value. Perhaps the day will come when it's useful and not expensive, but that's not this day.)
Cheers!
P.S. I added USB 3.0 via PCIe. It was $20, so I don't consider that useless nor an expensive port on the back!