- Should there even be a scrollbar?

Many apps present content in such a way that makes it impossible to tell if there is anything more on the screen until you actually try to scroll. The home screen of the app is so clean and so fitted that there is nothing poking out from the bottom.

oh gawd, please please please do not interpret this as pagination of windows with overflowing content!

the image carousel type dots or similar old skool pagination indicators are so much worse than a simple scroll bar.