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The problem is that not everyone has an internet connection for these games. So if an update is merely "improving" the game then that fine, either you have an internet connection or dont. But if you ship a "broken" game that is dependent on a title update to work as advertised then you really should have some mechanism in place to get that update to those without a connection. Or if you cant/wont do that then just be sure to disclose the situation so a consumer can make an informed decision.

EDIT: I recognize that there is a huge grey area between the two scenarios, but the principle is more important than any single situation.