Gyro on steam deck isn't really something you want to rely upon as much as gyro on a controller. Since you are physically moving the device it will move the screen which can mess you up. Have some kind of toggle for the gyro if you want, but you kind of just have to get used to the trackpad for aiming.
It has been good for me for aiming in tears of the kingdom but unlike and FPS it basically only activates when you actually need it, when you pull out your bow. In FPS games you are constantly moving your camera around so gyro gets annoying.
Basically for third person action games gyro = good but FPS games it is not as good.