https://www.cnet.com/news/how-macbook-air-showcases-the-battle-between-usb-c-and-thunderbolt/

Apple's other new device shows the magnitude of Intel's challenge. The iPad Pro, arguably Apple's embodiment of the future of personal computing -- has a USB-C port without the Thunderbolt abilities. Apple's decision might well encourage mobile device companies to get more serious about USB-C, but it sends the opposite message about Thunderbolt.

"It's really hard to know why two standards are needed," said Endpoint Technologies analyst Roger Kay.