The massive double standard in PPL privileges is that you are supposed to be able to navigate your way around controlled airspace (which, let's face it, is not exactly marked on the ground below
) but on the one hand you are not taught how to do this, other than by locating various ground features which hopefully tell you where you are.
If CAS didn't exist (the pre-WW2 situation, more or less) this wouldn't matter because nobody (other than you) cares if you get lost. If you are walking up Mt Snowdon then you are on your own, and that is how flying used to be in the goode olde days.
But CAS does exist and every year there are hundreds of spectacular busts, plus many more less relevant ones.
One day, probably long after I have stopped flying, something may be done about this, and the only possible thing is the complete embrace of GPS
I cannot get too excised about NDBs. They are OK for instrument training but only while one needs them, and usually there will be some NDB which can be used for that purpose - could even be a radio station if you get really stuck. Plenty of people train for VOR approaches around enroute VORs (like SFD) pretending they are somewhere else (at an airport).
They are OK for GPS backup but I cannot get excited about the 0.001% of the time that GPS is not working. One can tune in a VOR/DME then, or even call up 121.50.
If nav capabilities improve (which they need to, drastically, to do something about the CAS busts), the staff at D&D will end up twiddling their fingers and will be really keen on getting some calls.