Just because I've not had the center nub break in any of my USB-C devices that doesn't mean it's not a problem for someone else.
Similarly, I've had the springs in a Lightning port give out so that no cable worked and the port needed replacing.
I still think that having the springs in the cable connector is a more durable design but the USB-C center nub is probably too thin.
(edit) Here is the chief FireWire architect talking about the same design rationale for the FW400 connector http://www.johasteener.com/what-is-firewire.html#Why_the_4-p...
Just because I've not had the center nub break in any of my USB-C devices that doesn't mean it's not a problem for someone else.
Similarly, I've had the springs in a Lightning port give out so that no cable worked and the port needed replacing.
I still think that having the springs in the cable connector is a more durable design but the USB-C center nub is probably too thin.
(edit) Here is the chief FireWire architect talking about the same design rationale for the FW400 connector http://www.johasteener.com/what-is-firewire.html#Why_the_4-p...