> The much bigger problem comes when you can make the game unwinnable, but not actually lose right away
Yeah, that sort of thing instilled a life-long habit of constantly saving my progress and having saves that go back many hours. I specifically blame King's Quest II for that. There was a bridge that you could only cross a handful of times and then it collapsed. If it collapsed too early in the game, you are screwed and need a save prior to crossing it unnecessarily.