I really don't think it has to do with stretching out anything. They didn't approach it that way. Remember, in the 80's the predominant gaming platform was the arcade, which was developed for short but intense play times--forcing the player to buy more credits didn't hurt either. That philosophy relaxed going into the home, but it was still the mindset for most developers and players in the 8 bit days.
Once the home became established as the primary platform for game development, you saw the shift to games being longer and then judged primarily on length. Intensity of experience wasn't a priority as you could freely extend things to 30-40 hours.
Once the home became established as the primary platform for game development, you saw the shift to games being longer and then judged primarily on length. Intensity of experience wasn't a priority as you could freely extend things to 30-40 hours.