Without the regulations you could imagine an airport that pre-screened travellers. You roll up to the curb, get valet parked, and your bags checked, and then you get on the flight. You'd build the entire airport around this rapid on/off experience. You could have an airline that would run an Uber-style service to pick you up at your door. You'd solve the whole problem.

But there's no Toyota-style optimizations applied because these optimizations are illegal. Prime among them is that efficiency of this kind would make the airport more of a target IF it was also prevented by law from discriminating against potential dangerous passengers, which it would be.

And that's why when you ban selectivity at the federal level the necessary consequence is mediocrity.