Leaving the bets open while the ball is spinning causes a lot of players who think they can time the ball (or as another commenter said, believe the dealer might be cheating) to bet and presumably yields higher profits.
There are other countermeasures developed nowadays, such as Cammegh's RRS (Random Rotor Speed): https://www.cammegh.com/our-products/roulette-wheels/mercury... - essentially after bets are closed the wheel is able to ever-so-slightly slow down at random times, throwing off any prior calculation.
The clicker-type computers that rely on a human input don't need anywhere near the level of precision of hardware interrupts. A software-polled button will be just fine. But even if you did need the interrupts' precision, you can do it on any cheap wireless-enabled microcontroller and then transmit to an app on an unmodified off-the-shelf phone.
This is bullshit and designed to make their devices more advanced that the outdated junk they really are. I also have doubts they work, because if they did it would be in their best interest to keep quiet and not encourage casinos to deploy countermeasures.
There are other countermeasures developed nowadays, such as Cammegh's RRS (Random Rotor Speed): https://www.cammegh.com/our-products/roulette-wheels/mercury... - essentially after bets are closed the wheel is able to ever-so-slightly slow down at random times, throwing off any prior calculation.