General Aviation Pilot here - one thing they also leave out is the relaxation on the rules for overwater flight with 2 engines. Prior to the change, it was harder to fly oceanic routes as you had to fly way north to ensure that your nearest airport in case of engine loss was no more than X distance away. With the changes in reliability for engines, they have relaxed that rule which has made 2 engine flights (notable for US => Europe) more profitable as 2 engines flights consume way less fuel than 4 engines flights