Gyro and Trackpads are the Future; Analog Sticks Took Two Generations to Become Normal
As I've watched reviews of the Steam Controller, I've seen a lot of people who state that they don't use these features or find them necessary.
This feels about the same as using two analog sticks to navigate. When Alien Resurrection for the PS1 came out in 1997, critics complained about its dual analog stick controls, where the left stick moved the character and the right stick moved the player. 30 years later this is second nature and anyone not doing it is making a deliberate stylistic choice.
It's the same thing with gyro. It's such a better way to control the camera for aiming weapons than an analog stick that a good comparison is using 4 face buttons for camera control vs a stick. But it will take time for it to be properly implemented. Especially when only 1/3 of the console companies are really pushing it and 1/3 standard controllers don't even have it as an option.
Same goes for trackpads, which make strategy games playable in a way that they never have before, and the extra buttons on the back, which allow for further customization than we've had before, especially for those with movement limitations.