They're really bad at considering the actual logistical and tactical issues i.e. have they adequately cleared trees and cover from the bunker entrances, are the air intakes able to be shielded from gun fire which might pierce the filter assemblies, do they have adequate overlapping covering positions for them, how do you replace an air intake filter clogged with soot from someone burning a bonfire upwind for a few days, do you have adequate surveillance to cover nightfall?
I mean a fairly obvious problem is that starting a big fire near the bunker is more or less going to both clog the air filters and completely blind and destroy most surface surveillance gear...which let's you get in close and then duct-tape the air intakes up.
Have you ever had one of these people talk your ear off?
Hidden, remote ventilation intakes, surveillance, hidden escape hatches to flank their opponents, and overlapping cover are the sort of thing they spend their waking hours planning, dreaming, building, and earning money to afford.
Saying they're bad at considering logistics and tactics is like saying Lord of The Rings nerds are bad at considering the lore. Come on.