> Many browsers hide the scroll bar
On touch devices, yes. On desktop, not really. I think Safari on OS X is the only one, all others (basically everything on Windows and Linux) always show scroll bars on scrollable content. And on touch devices, users tend to try scroll quite readily, so I don't think clipped content is a necessity.
However, artificially stretching content to the fold is still against the idea of a (scrollable) website.