Not a QC vs. F question so much, but is the Acela Quiet car really that undesirable or do many people just not know they can change their reserved seating? Have an upcoming Acela trip where the 3 regular cars are almost completely full (2 seats at a table) and the QC is only half full. I wonder if the algorithm would assign seats to the QC upon purchase once that's all that's left. And then how do you handle pax who refuse to be quiet because they didn't want the QC but it was the only choice?