The problem with discussing what should be taught but isn't (lots IMHO) is that the majority of people who do a PPL are doing it to tick a "lifestyle achievement" box; a bit like walking up Kilimanjaro, getting laid (if you are 16), etc. They give up as soon as they've got it.
The schools need that business, and they would resist any broadening of the syllabus.
Otherwise, I would teach people how to fly A to B around Europe. It's not exactly hard. But look how many forum posts there are with subjects like "what's the best route from Blackbushe to Southend"? Makes you want to shoot their instructor
