That’s not why user scrolls up, or at least not the only reason. For example, reading this discussion I constantly scroll up and down to center the text on scre

That’s not why user scrolls up, or at least not the only reason. For example, reading this discussion I constantly scroll up and down to center the text on screen. If the header only appears after scrolling up for a bit then it’s not so bad, but most implementations show the header after scrolling 1px up. That’s infuriating.