Yeah, but that’s kind of the problem.
Think of it like this.
Right now, we are at the bottom of a curve that represents percentage of the player base that uses buildings, or barbed wire specifically.
If left alone, I expect that the usage of buildings will increase along this curve, as the player base explores new mechanics to improve their gameplay.
If you add damage to the barbed wire, as you said, maybe the usage triples. But it also shortens that curve so that all of a sudden, barbed wire is absolutely everywhere, and the usage will still be growing.
As a rule of thumb, players hate crowd control devices. Slows, stuns, flashbangs, etc.
In short order, it will be the new broken mechanic that every player hates because you can’t get anywhere.
On top of exacerbating other issues, like 25-33% sniper class picks in any game, or maps with not much cover, etc.