So, the complaints against USB coming from PS/2 were around the switch from pushing inputs to polling with a relatively low rate on vastly slower CPUs. Nowadays

So, the complaints against USB coming from PS/2 were around the switch from pushing inputs to polling with a relatively low rate on vastly slower CPUs. Nowadays CPUs are much faster and parallel; and the polling rates are in the 1-8 kHz as opposed to 100-400Hz. I don't see any pro gamers carrying in any kind of PS/2 device, they even moved to wireless so the differences are likely meaningless these days.