Who would spend thousands on pc components and vr hardware and then not go the extra .01 miles to have everything operating at tip top shape aka usb3.0?
The vive comes with camera wall mounts, its practically a must for a room without shelving or bookcases.
The usb cables need to go, it really makes your room sloppy to have 4 extended cables running along the walls. If your room isnt small you cant run them along the floor or ceiling neatly, having them go vertical only in the corner of the room, or you exceed max length. Its not practicle to run usb in wall and the cable is usually never in wall rated.
Yes 3 sensors is adequate but again, spending thousands of dollars if i get a hiccup in say onward at an inopportune moment and it gets me killed ill be pissed and ordering that 4th sensor immediately.
So you know better than the actual developers of the Rift? They advice you to use USB 2 for 3rd and 4th sensor.
3 sensors has perfect tracking if setup properly.