Daniel Nelson, programmer at Neversoft Entertainment, has this to say about the thumb sticks on console controllers:
Few controllers report zero magnitude at their rest position. Each controller reports a different magnitude at rest, and the same controller will report different magnitudes each time it returns to rest. Additionally, different controllers report different maximum magnitudes when pressed fully in a direction, and the same controller will report different maximum magnitudes when pressed in different directions.
He goes on mentioning how you can mitigate this issue by implementing dead zones, but I find it extremely interesting because it’s exactly the sort of problem that we never think about until we encounter it in our designs. Every time we pick up a console controller, we take reliable thumb stick response for granted, but that does not mean that it does not pose a challenge to developers.