the game should punish the people who don't want to cooperate, not reward them
You can always ask the Commander to unlock his Tank in Chat, but its way better with lockable Tanks as having one in there who doesn't cooperate. And this gets prevented with lockable Tanks.
This prevents (sorry for rude language) random idiots, to spoil someones Game. More often that not people who friendly ask something will be capable of Teamplay, so lock first, unlock for nice Teamplayers.
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