Is having to arrive 3 hours before departure efficient

Just heard that to catch an international flight from Australia one must arrive at least 3 hours before flight departure.
Domestic flight? 2 hours before departure.
All one has to do is use the self serve electronic check in terminals to confirm plus check in baggage.
That should be a smooth process, yes?
Airlines are treating passengers as mugs

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Northwest · M

Try flying out of Tel Aviv or to Tel Aviv. Four hours pre-flight, and you need most of it for the security "checkin". The entire security team that processes a flight, must join the flight.