I vehemently disagree about the praise for the 3.5mm headphone jack. The same problems it had in the '80s are still with us today.
The problem has always been, like every connector ever devised by humankind, "Good ones are good and cheap ones suck". I've got a Sangean portable radio that I've had at least 20 years, and I've never had sound cut out or had to mess with moving the plug around to get it to work. My Gen One iPod still works fine. My old brown Zune 30gig with the mechanical drive inside has never had any problem with the headphone jack, and I've plugged and unplugged my phones tens of times a day.
I've thrown away a bunch of clever little low-cost devices where the headphone jack is just shit.
You really think that USB-C isn't going to have the exact same problems? I've got an ASUS tablet over here that I use to read out on the back porch and I've got to do all sorts of jiggery-pokery to get the thing to charge because the USB-mini (or micro, I can't remember which is which) jack has gotten looser than the Octomom's hoohah. All jacks go bum. I don't care if it's Thunderbolt or USB or firewire or eSATA or whatever.