> In the former case, it's trivially easy to jog the screen up and down or sideways, to see if there's missing content "I jog my screen around to see if anythi

> In the former case, it's trivially easy to jog the screen up and down or sideways, to see if there's missing content "I jog my screen around to see if anything moves" is a clear sign of two things: One, that you're looking to see if there's missing content. Two, that you do not know if there is missing content. Missing content should be made evident by a display system designed to make it easy to access content. If your display system is hiding content from you and not showing you this, then is it really doing a good job of helping you access content? Plus, consider how many users won't do the trivially easy thing. At scale, I would lay good odds that it's a disturbingly high number.