I mean, the TSA already scans your passport/id, and knows every other detail about your trip. Is a facial scan really adding much more? Last time I entered the

I mean, the TSA already scans your passport/id, and knows every other detail about your trip. Is a facial scan really adding much more? Last time I entered the country they used facial recognition and I didn't even need to show my passport. So they obviously already had the data to recognize me from my passport photo. And this was over two years ago.