Really customers have about as much choice in the comfort of a flight as they do in the cost of health care services.
For years it has been "pay 4 times as much as economy or suffer", in the last ten years they've introduced "basic economy" which at least is realistic.
I might rather fly in a widebody on a domestic flight but I don't get the choice. One reason you hate to fly is that you hate to fly in a 737 (or A320) and you never get to fly in anything else so you just don't know it could be better (at a lower cost per seat mile!) in an A220 or E195.