It’s not about being able to push both movement buttons at the same time, it’s about being able to push more buttons in general. For hero shooters, mobas, MMOs, and other games with lots of inputs spreading out your reachable keys is really good.
I can’t play souls games on anything but a steam controller. The pads are so much better than a stick for camera movement, and the pads are incredibly useful with the games’ awkward layout for sprinting.