Originally Posted by San Gottardo

And again, I don't understand the question. This mechanism does exist and it works. So why are you trying to explain me, who merely points out the fact that it does exist and work elsewhere, that it doesn't work. Isn't that a bit futile? Reminds me of a discussion with someone in Germany some years ago, where I remarked that they didn't have credit-card check-out from parking lots (they always need to go to the machine and pay there before picking up the car). He also explained to me that this wouldn't work, it would mean that there are credit card readers at the exit, and what if someone forgot his card, etc. All kinds of reasons he came up with which either because he had never seen something like this or some remotely possible extreme situation. Completely ignoring the fact that credit card check out at parking exits existed and worked well all over France. Just doubting that something works only because it's unfamiliar, an interesting human trait.