I don't use flat bars!
They are a reletively "old solution". A few years back the door tools were not as advanced as they are today.
There are many other choices now. IMO: flatbars are awkward. I have one, but it collects dust.
As thick as they are and with such force on the window, I agree that they could be "window breakers", although I have not broken one with a flat bar, nor have I heard of such happennings, too often.
I try to go through the window as much as possible, and drill only when neccessary.
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