In these COVID times, the check & balance for carry-on-only passengers should have - at least - taken place at the Gate. In many European airports - like our home airport at AMS - if you're a carry-on-only traveler, traveling inside the Schengen zone with a boarding pass or QR code on your phone... you simply SCAN your boarding pass to enter the secured AIRSIDE area. Then you go through security (X-RAY) and head for your gate. We've flown a few times in these COIVD times (including easyjet) and, at times, our COVID credentials were checked at the gate.
Prior to COVID, there were many times we flew to other Schengen cities and we never spoke/interacted with anyone. That's because many gates also have scanners where you scan your own boarding pass/mobile QR code without any gate-agent assistance. Often, we would comment on how it seemed unusual that we could fly all over Europe, carry-on-only, and never show our passports...or interact with anyone.
In recent COVID experiences, we've had temperature checks, been greeted by officials in HAZMAT suits, and had to show negative COVID tests. It is disappointing given all the restrictions we've had to endure for 15+ months that these airports did not follow the protocols. Let's hope these missteps do not lead to another surge... as we're just starting to have some sense of normal.