blackshoe, on 2017-February-07, 08:40, said:
The reason for that law is because it's not possible to unring a bell that has been heard by partner. But screens solve that problem inherently, and the need for accepting IBs that haven't been pushed through is gone. This regulation allows us to get a normal bridge result, without the need to tell partner to ignore UI, or worry about whether they managed to achieve a result they couldn't have gotten without the irregularity.
It's not much different from the way electronic bridge totally prevents these types of irregularities. They're considered "part of the game" only because the traditional playing technology makes them inevitable, not because we actually want to allow them.