I wouldn't say that PPL training (not what I got 5 years ago, for sure) is adequate for navigation when surface features are not VERY clearly visible.
It's all very well to do a VOR/VOR (or VOR/DME but then DME is not covered in the PPL at all) fix but what if there isn't a VOR/DME in range?
Also, a lot of rental planes don't carry the equipment, or it doesn't work.
There are a lot of double standards in this business, but in this already massively over-regulated activity one must never argue for a reduction of privileges
