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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OogieBoogie · F

They say this is for a more relaxed experience.

Its not.

Who wants to sit for hours in a busy airport or stuffy lounge?

And what if the flight is delayed?

Ugh.

Gusman · 61-69, M

@OogieBoogie Passengers are held to ransom and there is not a thing they can do about it.
When a plane lands it has a maximum of a 2 hour turn around time, very rarely does this fail.
So much needs to be done to turn a large plane around, most of the time it runs smoothly.
Passengers need only to check-in themselves and their baggage.
Should not require 3 hours for that.