Comment by scott_w
1 day ago
Funnily enough, this caused issues with PS2 games ported to Xbox subsequently. Metal Gear Solid 2 made heavy use of the pressure sensitive buttons for weapon aiming vs shooting. I recall the Xbox didn't have pressure sensitive buttons, so had to do something different to achieve this (I'd need someone else to fill in the gaps here, I never owned an Xbox!)
Original Xbox had the pressure-sensitive buttons, but 360 did not, which specifically caused issues for MGS 2 and 3 in the HD Collection. Twin Snakes on the Gamecube suffered similarly, requiring awkward combinations of Y and A to lower your pistol or raise your automatic weapon without firing.
THAT'S WHY. As an avid Metal Gear enthusiast during the release of MGS2, I remember having nearly-impossible time finding MGS2 Substance for PS2 when I wanted to do my first real replay way back in the day. I imagine it was the more popular version since it had working pressure buttons, presumably.
The original Xbox actually did have pressure sensitive face buttons. Off the top of my head, the only game I know that used them is Vexx (which strangely didn't use them on the PS2...)