Lukas Mathis on iOS’ increasingly modal, confusing behavior when the Home button is tapped:
If I launch an app from the fifth home screen, is it highly likely that the next app I want to launch is also on that home screen? If I launch an app from inside a folder, is it highly likely that the next app I want to launch is also inside that folder? Probably not. So why not just send me to the first home screen when I hit home? That way, I always know where I end up when I hit «home».
I’m with Lukas. I think a single tap of the Home button should always bring people to the same place: the first home screen, with no folders open.
And if you’re already there, it should leave you there (i.e. do nothing), not toggle the Spotlight search screen.