Iris scanning is already widely used in the U.S. and hasn't received much scrutiny. It's in the news all the time, e.g. with the owners of Madison Square Garden using it to keep their political enemies from going to concerts. You probably use it every time you get on an airplane already. Even LinkedIn uses CLEAR to power their verified profiles.
False. More importantly, however, this is an example of the "you're already doing it so it's not a big deal" fallacy.
I'm not saying it's not a big deal, I'm saying it hasn't gotten much scrutiny, at least relative to comparable innovations in the past. E.g. when airports introduced body scanners, Jeffrey Rosen wrote an entire book about this called The Naked Crowd. Where's the equivalent scrutiny for iris scanners?
You can still hand your passport and boarding pass to the gate agent, it's not required to do facial recognition boarding if you don't want to, and at any rate it's not doing an iris scan, it's using a standard facial dotmap to match to a photo. It's not even doing 3D mapping, because it's source material is a standard passport photo.
There is no facial recognition in the normal re-entry line (and all these processes are before customs as part of border control). Foreigner entry may now require facial recognition, I’m a US citizen so don’t experience the process foreigners go through.