Brake conundrum

I like learning new things but it does surprise me to learn that a method that has worked for years is now somehow supposed to be wrong.
How did I avoid damage all these years by bleeding every power brake car and truck with the engine running?
I'll admit that there may be some validity to the claim ( Engine off for bleeding power brake cars) but how did I dodge bullets for almost 40 years? Seriously...Nobody can be that lucky.
In construction, I've butted heads with stubborn old timers that claim I've always done it this way.
It can be easy to hide substandard framing under stucco and drywall but automotive work is far more precise.
I've owned something like 66 cars and trucks in my 57 years. I've done countless brake jobs, mostly on power brake models.
How is it that I have never damaged a brake booster by bleeding the system with the engine running?