You've missed the point. If coldboot only works on low firmwares and you want to play a game that requires a high firmware, then you can't play the game.There is really no disadvantage to coldboot, it only makes life easier. You just install it and done, no cables, jigs or anything. Just simple easy permanent privileged access to the entire system with no user interaction.
Having the option to coldboot into an emunand that has a higher firmware would fix that, assuming its something we'll get.