I'm in the country legally, and I don't care at all how often that is confirmed or by whom.
> What's the alternative? Human beings eyeballing a license a few seconds?
The alternative is dispensing with the notion that some people are illegal and must be purged, or even that this a legitimate function of government.
As long as the state can feign incompetence (let alone launder it with a facial recognition app), this power can easily grow to arbitrary executive authority.
I have no problem with faces being recognized; that's a normal part of living in society. Computers doing it is just a bit more efficient, as you point out. The trouble comes when the state uses it as a liability limiter for their crimes.