I like to play all my tracks from my library in shuffle play or all the tracks from a decade or genre. This feature is present on the device (Play in my case) but not from within the app (anymore?). The buttons are only shown when I select an album but not in a genre etc. Please make this feature available in the app, too. Device vs. App:
I just found out that the buttons appear in landscape mode on iPad. So they are just missing in portrait mode which I prefer.