Back in the day, they had to ship complete working games, because the cost to fix it later was too high.
Not that they wouldn't mess up all the time, but the punishment for messing up was severe.
And paid expansions were often the size of a whole game by themselves. Those are a lot of value, and there's nothing wrong with them. They even still exist today, though rarer.
Maybe the NMS's updates did amount to one or two expansions throughout the 10 years of updates, but they were done piecemeal. Were it not a game that massively under delivered on release, they could've gone that route.
Not that they wouldn't mess up all the time, but the punishment for messing up was severe.
And paid expansions were often the size of a whole game by themselves. Those are a lot of value, and there's nothing wrong with them. They even still exist today, though rarer.
Maybe the NMS's updates did amount to one or two expansions throughout the 10 years of updates, but they were done piecemeal. Were it not a game that massively under delivered on release, they could've gone that route.