You make it sound like dual shoulders were standard, but PS(2) was the odd one for having that. None of N64, Xbox nor Gamecube had them. It wasn't really until the Xbox 360 that you'd see it outside of Sony.
Now that you mention it, maybe I'm thinking more of the dual analog sticks than the shoulders. But yeah, Gamecube at least had a Z trigger in addition to the shoulders.
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You make it sound like dual shoulders were standard, but PS(2) was the odd one for having that. None of N64, Xbox nor Gamecube had them. It wasn't really until the Xbox 360 that you'd see it outside of Sony.
Now that you mention it, maybe I'm thinking more of the dual analog sticks than the shoulders. But yeah, Gamecube at least had a Z trigger in addition to the shoulders.