Thanks for your inputs! Iīve always thought DF enhances safety, having seen some situations that I would never have thought possible. E.g. instruction to acft A, readback by acft B with the callsign of ACFT A, the DF saved me.
Another one: ABC445 is expected to call, but itīs ABC455 that calls in a busy situation, about 100miles away. ABC455 was accidentally sent to this frequency and misidentified for ABC445. DF was U/S at the time, so ABC455 complied to the instructions and a lot of confusion was created.