I obviously can't verify it without taking undue risks, but I remember they used to ask to see the boarding pass, now they don't.
Then again, if they have this system where they can match me to a flight by ID, why they need any boarding passes at all? Just ask to see my ID again when boarding the plane, no? Why boarding passes still exist if this system is in place?
If you have precheck, TSA is pretty much not an issue now (unless you fly out of one of badly run airports where they are massively under-provisioned) - just ID check and quick metal detector pass usually does it.
Then again, if they have this system where they can match me to a flight by ID, why they need any boarding passes at all? Just ask to see my ID again when boarding the plane, no? Why boarding passes still exist if this system is in place?