The blinking shields are a "fortification" buff on the blocks in a 3x3 area provided by the block in the middle. When that central block is destroyed, all the remaining blocks lose that buff. Since you don't get a full refund for destroying your Turrets, you want to build up and use all your remaining Turret entrenchments before replacing your existing ones. Similarly, you'll rarely want to destroy buildings, it is more efficient to build upwards.
You don't miss with these
Wtf;) it's an absolutely crazy management and gaming style😂
Ok I took interesting emotions
The blinking shields are a "fortification" buff on the blocks in a 3x3 area provided by the block in the middle. When that central block is destroyed, all the remaining blocks lose that buff.
Since you don't get a full refund for destroying your Turrets, you want to build up and use all your remaining Turret entrenchments before replacing your existing ones.
Similarly, you'll rarely want to destroy buildings, it is more efficient to build upwards.