What are you planning on doing about allowing for reconnections to complete a game? If a player wants to reconnect and isn't trying to quit they should be able to. We all have dodgy internet sometimes.
We've tied ourselves in knots trying to solve this in the past, and it's a very complex issue for various reasons. I agree: even in the event of a power cut, where we obviously can't control that, there must be something we can do to minimize the loss of any data.
Lots and lots of technical requirements (IE rules that all games must follow for various platforms) make it more complex that it seems on the surface. But we will try and find a way that satisfies the desire to save within those requirements.