Personally, I am extremely happy it's USB-C only and it has no USB-A ports. USB-A is one of the worst popular connectors in history. USB-C is great. Going full

Personally, I am extremely happy it's USB-C only and it has no USB-A ports. USB-A is one of the worst popular connectors in history. USB-C is great. Going full USB-C gives the manufacturers the incentive to produce native USB-C hardware. Don't worry, eventually all hardware will be USB-C and the world will be better off. Yes, you will need to buy new hardware. You're buying a multi thousand dollar machine and you are concerned about the price of a YubiKey?! And for expensive stuff, like professional audio interfaces you can just use a dongle. With a YubiKey dongles are a PITA. For stuff that stays on your desk, not so much. I still use a FireWire audio interface. On the other hand I regret the loss of HDMI. While I can expect to get a new YubiKey, it will take at least a decade for all the HDMI-only TVs and projectors and whatnot to be replaced. Carrying that dongle is a PITA, just like carrying the ethernet dongle.