I get that the EU want to integrate their passport control process, cool.
I did it in February when it was first rolled out. Nice, according to the EU’s own information they now have my details for three years. Except I’ve turned up to Milan airport this morning and I’ve had to go through the physical passport control again as they won’t let anyone with a British passport use the e-gates
So in reality there’s no point to it at all! You go through it all every time, it’s just another layer of EU bureaucracy designed to make things more complicated. I have no doubt that some people have made a pretty penny off it though!