Present state. They are moving towards facial recognition with no need for ID presentation or boarding pass. No need for the ID when they have your photo on file (this is how Global Entry re-entry kiosk works), and your identity is tied to airline PNR.
https://www.cbp.gov/travel/clearing-cbp/passenger-name-recor...
https://www.youtube.com/watch?v=EnxfsZrnPv0
(enrolled in the CBP program 1:many program mentioned)