This is one of the opportunities though - yes people will often book cheaper, whatever they can do to save (although as my friends age I’m noticing quite a few more willing to pay for PE Int’l or even J domestic), but people also don’t know what they are buying.

If the cheapest flight/seat included one of the videos of WS pax sitting down, or some way for a person to reliably understand the size of the seat I would guess that a solid percentage of those folks would pay more for a bigger seat.

People buy flights months in advance with no real idea of what the seat will be, nevermind aircraft swaps, so it’s not a shock they complain when they realize how tiny the actually seat is.