I haven't gone searching for answers, but purely from speculation, the sturdiness of the USB Type-C ports seems like a regression with comparison to USB 1/2/3 ports. I love how rugged USB ports have felt in the past (that is, before type-C).
It's possible that's because my Type-C hardware is newer, and the other hardware I'm comparing it to has years of use. I find that with regular use, connectors and ports naturally loosen up over time.
One other possibility might be spec compliance. A lot of the third-party Type-C hardware out there right now isn't fully compliant. If you're shopping for Type-C adapters or cords, definitely only buy stuff that's 100% compliant.
Original USB: 1,500 connect-disconnect cycles
Mini USB: 5000 cycles
Micro-USB: 10,000 cycles
USB Type-C: 10,000 cycles
[0] http://www.anandtech.com/show/8377/usb-typec-connector-speci...
Simply put, connect-disconnect cycles aren't the biggest threat that USB style cables encounter in normal use, and so this metric has little to say on the topic of cable ruggedness.
The worst part is that the cable is hard-wired to the supply so I had to throw out a very expensive supply instead of just replacing a cable. I had to pay for a real google supply because it is the only 60W available. The second closest is the Apple at 35W.
And, the google supply comes into stock once a month and sells out in two days each month. I had to wait and check the site twice a day. I suspect people buy them for other devices since they can't be matched.