The last NDB approach I did for real in IMC without some sort of GPS to provide final approach track guidance was in 1994. Using GPS even if it was “unofficially” always resulted in the flight path of the airplane being aligned with the runway, so I basically ignored the ADF needle.
The last use of the ADF went away when the good rock and roll stations went to FM or satellite. The NDB is 90 year old technology and is long overdue for the dustbin of old crappy nav aids like the radio range. Good riddance !