I am told it is impossible to order a Boeing 787 or the new 737 Max with an ADF. None has ever been or ever will be certified on those aircraft. so how are they flying IFR in EU airspace ? The debate is already over and it is inevitable that GA is going to get pulled into the 21 st century, no matter how much kicking and screaming comes from the Luddites
The ADF is ancient unreliable technology that IMO should be banned as unsafe.