I can think of one instance. After Apple released the 3rd gen iPod Shuffle (gumstick) with no buttons they said at the release of the 4th gen iPod Shuffle event

I can think of one instance. After Apple released the 3rd gen iPod Shuffle (gumstick) with no buttons they said at the release of the 4th gen iPod Shuffle event: "But users clearly like the buttons". So then the next gen had buttons just like the 2nd gen.