That " PSOne....because I am wrong" is very tempting. I too disliked including a 1, as the system never had a one in the title. Although at times I feel if you don't specify, and just say PS, will people default to the current gen for the interpretation? Historically I leaned to PSX, but in recent times I begrudgingly type PS1, probably to avoid that guy chiming in with, well actually PSX is a Japan only PS2 media...blah..blah..blah.
You know what...screw you guys, bring back PSX!