Considering the number of times I've sheared off a USB-C connector vs ethernet, I wouldn't consider USB-C to be more robust than RJ45. YMMV.
Even when it's your job the usb are still handled and cycled way more often. You might handle 100 ethernet jacks today, but it won't be the same one 100 times. You plug it in and don't touch that one again for 5 years.
Some people will embrace any absurdity to pretend to be right.