That's clear, but there are some progs (okay I only know one: lsusb - which i mentioned) depend on /proc/bus/usb (=usbfs), so those loose functionality without it.
Well i could just try to mount it, and stop blabbing about it
Edit: Hmm weird, something else must've been going on at that time. I still don't have it mounted, yet lsusb now shows the correct output.