I strongly believe in freedom so I'd vote against this.
Consider that a new player who goes to the mainland too early, always can create a new character. Not much is lost there. The levels are rather quickly regained.
And to force old players who just want to create a new character quickly, to go through beginner's missions again, is dull.
If this is a serious concern, then we could rather change Chiang's mission text slightly, so that when someone wants to leave for the mainland he cautions a bit more.
Consider that a new player who goes to the mainland too early, always can create a new character. Not much is lost there. The levels are rather quickly regained.
And to force old players who just want to create a new character quickly, to go through beginner's missions again, is dull.
If this is a serious concern, then we could rather change Chiang's mission text slightly, so that when someone wants to leave for the mainland he cautions a bit more.