alt Hacker News> in the EU you need to go through it both on every arrival and every departure.
You absolutely don't. If you've done it once on your passport/ID you don't need to do it again. And infact there are fast track autonomous lanes that you can just scan your EU passport with biometric chip and fly through. (In theory, there's always idiots who don't realise they don't have it)
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I just visited Italy. We absolutely passed through biometric scans on arrival and departure from FCO (US passports, vacation so no paper visa).
And then again at DUB outbound (US pre-clearance, so the normal Global Entry kiosk).
All of this was expected. The only thing that surprise me was there was no passport check or any other custom/immigration at Dublin on the inbound leg. We just walked from the arrival gate to the departure gate and that was that.
With the introduction of EES system (whose implementation was completed only a few months ago), the full data of non-EU citizens gets collected the first time we enter the EU and then we have to verify it every subsequent time.
Not much of a hassle at airports due to the availability of self-service kiosks, somewhat of a hassle when crossing with a car, and infuriatingly annoying when using a mass transit option like a bus or a train where everyone has to step outside and wait in line to do that, adding about 20-30 minutes to the border crossing.
People without EU citizenship also enter EU.
Recent changes to EES system have been a disaster, and as op has pointed out, people do have to scan their biometrics more than once coming from a non-EU country. In some cases even if you are a EU resident in case the airport has no specific queues.