How is coming to the airport earlier supposed to solve what's obviously a throughput problem? Sure, for an individual it reduces the chances they'll miss their flight. But if everyone does it, there's obviously no change. The only way showing up earlier would help with throughput is if there are periods of time where the security is under-utilized with absolutely no queues. Which, from my experience with US airports,…
Show up earlier, and if they process everyone earlier, everyone will get through in time.
Of course, this does not help you get to your connection on time.