Not if you are a regular traveler. In that case you have global entry and/or clear, and aren't checking a bag. Depending on the exact terminal you can get to the airport about 15 minutes before boarding, 45 minutes before listed departure. The bulk of the advantage is the location of the terminal stations, which is real but not as significant as it is being made out here. I mean maybe if you live right at Penn Station and your meeting is right by Union Station, but if you coming from, say, LIC and going to Georgetown, you may be happier with LGA and DCA than NYP and Union Station.

You're absolutely correct about the comfort points, but price should be just as strongly in the train's favor and it isn't.