IIRC, there were quite a few economic/technical reasons why PS/2 has gone largely extinct. RS232 and PS/2 are hardware interrupt driven instead of using polling

IIRC, there were quite a few economic/technical reasons why PS/2 has gone largely extinct. RS232 and PS/2 are hardware interrupt driven instead of using polling like USB so they have always had a relatively high opportunity cost. Nowadays you'll only see PS/2 ports on workstation motherboards with higher end chipsets (which have more lanes on memory/PCIe buses, more hardware interrupts available before they need to be coalesced into software interrupts, etc). Also, PS/2 wasn't (generally) hot-swappable back then. That annoyance and some extreme pricing competition in the 2000s drove everyone towards USB.