Maybe this question is totally dumb, but I was always under the assumption that if I connect a game with my Google Play account (if that's offered), my highscores, progress in games, etc. will be saved and restored if I connect it on another device or re-flash the phone's ROM?
However, with many games (like HexaBlast, Lara Croft, Temple Run etc.), no game stats and levels seem to get saved, I'm starting from point zero.
If Google Play Games isn't good for that, what's the actual point of connecting a game to Google Play Games at all?