Here is the Issue, your way of doing things implies that you need a LOT more time to break walls than in real Life, just to be able to wait out the time it takes for you to get back into the Game. Back in ancient times the Romans often just walked up to a Castle Wall and pickaxed it open, while the person behind them protected them with a Shield. This process is faster than what would be required for your Bunkers in regards of harvest slowness.
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