Original PlayStation for not shipping with dual analog sticks from the start. Almost all games had to be playable with non-analog controllers. As a result, dual shock support was mostly an afterthought. Especially FPS games were awful to play.

Imagine the games that could’ve been possible if all games were designed with two analog sticks in mind. We would certainly have fewer games with tank controls.

I think this is also the main reason why it didn’t take until PlayStation 2 for developers to realize that the second analog stick is awesome for camera movement (instead of awkwardly mapping camera motion to the shoulder buttons).