Briefly said, I would be able to share 4 USB 3.1 devices with 4 PC instead of sharing 4 USB 2.0 devices with 2 PC.

I.e.: Currently I have this (Aten US224):

And I would like this, which is close to 90€ (Aten US434):

There is also a cheaper version, named Aten US424, to share 4 usb 2.0 with 4 PC: