As a frequent traveler (> 10^6 km), this is EXCELLENT. It's about time we start questioning the totalitarian police states in our own airports, especially in small airports/planes where stakes are smaller and security is a huge part of total transit time.
The time lost from pre-flight delays in airports is not the average time going through the procedure and waiting in lines, it's the maximum time. If it takes 10 min 90% of the time, and 40 min 10% of the time, people need to arrive >40 min in advance to avoid missing flights.
That said, the fact that the internal cost-benefit analysis seems to focus on $115m cost savings, and not the huge cost to people's time (and stress... probably comparable to newyork.cbslocal.com/2018/03/14/str…) does disappoint me. Time costs and stress matter too!
See also, Bruce Schneier's piece on the proposal:

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