It would be intesting to find out if ANYONE flying IFR in CAS in the the modern era is actually USING an Approximate Direction Finder to actualy navigate!
For en-route, pretty much all the airways are VORs and Intersections.
Ok on some approachs, the initial Fix may still be an NDB but often they are getting replaced by VORs or moved to simply be an "intersection" as busy airports need multiple STARs and each starts in a different place, they arn't building new NDBs to mark these fixes!
I hope EASA wake up and standardise the IFR equipment list across Europe. DME I think has some safety arguments to be actually fitted, and certainly some approaches depend on it, but I've always struggled with the benefits of the investment in the ADF. When you try following one in a modern airplane, the aircraft actually shows you how inaccurate they are! Its frightening, you can end up flying curves and corners (due to reception anomolies) when it should be a straight line!
In a Cirrus its like fitting world war two technology to the space shuttle.
Ian