Older games were hard because they were programmed to be hard. Most games were not that far removed from their arcade origins. You were supposed to die and die often as that was the only way the machine could keep making money off of you. Translate that into the home market and you have a game that you could, theoretically anyway, keep putting quarters into until you finished it.. which would make most old school games all of 30 minutes long. To replicate the arcade limitation of running out of quarters, players in home games were given limited continues.