Can nothing be done to fix the rPi USB interface?
No, it's shit. It's the SOC's USB that sucks, so unless they change the SOC the shit USB is going to be there for good. If they change the SOC, then it's no longer a Pi.
That's why the BBB works, it uses a totally different Ti ARMv7 SOC, not the older ARMv6 in the Pi.
To be fair on the designers of the Pi, the USB was there for a USB keyboard and perhaps a USB wifi dongle so school kids could get the things running (hence the composite video output also). It was never designed to run 20-odd bitcoin miners hanging off multiple hubs. They would probably have put a couple of PS2 ports on the thing if they had designed it a few years earlier...
The BeagleBone Black's design is more geared towards the 'hobbyist', so faster more capable SOC, better cape support, and the eMMC is fantastic to have.