USB-C: You cannot connect external storage at the same time as you charge your MacBook. This essentially means, if you're the type of person who likes to maintain a live storage back-up and keep larger files off your "completely not upgrade friendly" limited flash storage, you have to use a USB or Thunderbolt port to access those files. Power users or at least, professional users are going to want to use their MacBook plugged in so that when they finally leave their workstation, they'll have battery for the road. So what's your only option? Cloud storage. But conveniently, Apple's cloud storage syncs much better with Apple devices and your mobile iOS devices. What a coincidence that USB-C adapters are starting out at $79.99 when iCloud storage upgrades can be had for as "little" as $47.99 per year for 200 GB. Apple wants us off external drives. They want us in the cloud. There'd be no reason to push such a thin, small device that requires only one port unless they not only wanted the smaller form factor, but WANTED the consequences of what you lose. And these consequences generate more revenue for them. So of course they'd toss out Thunderbolt/USB 3.0.