The point of the SWA article though, is that airlines don't seem to realise that people carrying masses of carry-on onto the plane slow down the boarding/exiting so much they delay the flight and cost far more money than handling bags would.

Also it isn't the baggage fees with Ryanair so much as the price you pay is completely unrelated to the advertised $1 price for the flight. You can only find all the taxes and fees once you have completed the booking - they have even sued external price compare sites which show you the full price. They are constantly being investigated for this under various Eu consumer laws.