Having to add a flaky USB hub to your desktop just to plug in your keyboard is actually ridiculous. It makes sense on a laptop, but these desktops have _a lot_ of surface area on which they could put a few USB-A ports.
EDIT: Though, Apple removing the USB-A ports from everything might be what the industry needs to push peripherals to use USB-C for everything? If that's the case, then that might be a win for everyone, except for people who buy these new iMacs.