That's one of the minor issues. But the main point
is that PS/2 was
specialised anyway - can only deal with a narrow set of devices, and is
fickle about those, while USB lets you connect virtually anything
(handwaves details) so the potential exists to reduce the number and
diversity of sockets. That's my opinion, anyway :)
And why is this a Good Thing? My point is that it's to be exptected that
a modern PC will have a keyboard and mouse connected to it. Why does it
make any difference to the used if those can be connected to 2 of the USB
ports or to 2 specific connectors for them?
-tony