> Dense seating in economy, is the sole reason

On the Qantas 787 (which I fly regularly MEL<>SFO) the seats in economy are IMO better than the A380 (which I used to fly MEL<>LAX)

787 economy has 32 inch pitch; 17.2inch width: https://www.seatguru.com/airlines/Qantas_Airways/Qantas_Airw...

A380 economy has 31 inch pitch; 17.5inch width: https://www.seatguru.com/airlines/Qantas_Airways/Qantas_Airw...