> Or scrolling represents a viewpoint, such as a frame Which is not natural. The manipulation of a trackpad matches the manipulation of a document, natural. T

> Or scrolling represents a viewpoint, such as a frame Which is not natural. The manipulation of a trackpad matches the manipulation of a document, natural. There's no real world concept of a 'viewport' that makes sense with documents other than our own eyes; we don't move our eyes with our hands, unnatural.