Having just moved 30GB worth of files in less than a minute to an external SSD across USB 3.1, I don't really see the need to make things faster for USB devices. External SSDs aren't meant to run an OS. It has always been inadvisable to run a true OS through USB since the connection isn't 100% stable. I run virtual machines off USB drives all the time, but I wouldn't want to run my primary system that way and risk losing important data due to corruption.