It's no a requirement, just a recommendation. Or it just wouldn't work at all
As for your idea - it's not so. The problem is not in the CPU. In my article I wrote about the BSEL mechanism. On the CPU side the only thing is to pullup to Vcc or down to Vss three (in case of LGA771\775) grids. They don't even have to contact to the grid. Only connected in the proper way in the socket. No connection. So Intel can't make any influence due to the mechanism of Bus Selecting.