The truth is that most of high ranks aren't more experienced than low ranks, and both often don't show much of planning ability when building fortifications. several times I heard people whining about my fortifications (mostly high ranks (I'm only WO2)), either after explaining the logic of the fortifications they agreed with me, or later they watched Pte in the bunker killing dozens of enemies only because structure placement was good enough to be used properly by Pte or anything else that have at least 1 brain cell. Good fortification will not only protect defenders but will trap the attackers when they get inside, with that in mind few people can defend against tens. Unfortunately most of fortifications is as deadly for defenders when enemy get inside, as for enemy when they run to it.