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For why USB is hard, see http://www.usbmadesimple.co.uk/.

Ugh. This website saved my ass trying to make HID devices work on top of the completely non-conforming Linaro DwUsbHostDxe driver (look at https://github.com/andreiw/RaspberryPiPkg/commits/master/Dri... for a laugh). I did end up having to hit the USB spec in the end, but it's a legit resource to get a birds-eye view of the whole USB1 and USB2 thing. It doesn't make USB simpler, but sure makes it more approachable.

Offtopic: What's the end goal of all this UEFI work you're doing for the Pi?

No concrete goal beyond having a reasonably useful UEFI development environment (more so than the 96boards one).

It’s been useful to be able to run the same Ubuntu and SUSE images as VMs and servers do, but that’s only really possible because the built kernels have RPi3 support (but at least you now don’t need a custom image with U-Boot).

Actually, good question to flip back to you.

As a random person stumbling upon this, what value would you assign to it? What could you imagine the end goal to be?

Arg! This is so awesome, but is as though USB 3 never existed.

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