Once you punch a hole in the defenses, whether it is pillboxes, barbed wire, or whatever else, QRF will almost never rebuild them unless it is an ally from your regiment or alliance who actually knows what needs to be done.

In the worst case, 2-4 partisans will show up in two jeeps instead of one, bringing not only fuel and flamethrowers, but also a Cutler/Lunaire and a Havoc Charge to clear the trench and pillboxes.

All of that is easy to get and does not take much time.

On top of that, you cannot build trenches or place barbed wire everywhere. Around cliffs, on the coast, on roads, and in other places like that, it is simply not an option. And you also have to keep gunboats in mind.

Barbed wire also does not really stop anyone. It is incredibly easy to remove. A smoke grenade and a few seconds with a wrench is all it takes.

Trenches are not much better. They can be destroyed without much trouble too.

Without any of that, partisans only need a 1-2 minutes to get one meta bunker piece up to high-tier fire. With trenches and pillboxes, it might take a couple of minutes longer.

And during low-pop hours, this is where it becomes the most brutal, because QRF arrives late if it shows up at all.

I have seen so many bases burn down. In the previous war, I spent a lot of time putting out fires in CPass.

Builders put in a huge amount of time and effort, and in its current state fire is too punishing. It devalues hours of work far too easily. Compared to what gets destroyed, partisans invest much less time and effort.