IIRC, the last “multi-service” aircraft, was the McDonnell-Douglas F-4(x) series aircraft. The train of thought was, at THAT time, that the ‘dogfight’ was a thing of the past, and that all aerial combat would take place at distance, with the use of missiles, only. The skies of Vietnam proved that to be a fallacy.
So, in the new world of ‘stealth’, all else goes to the wayside, again, until the next time our intrepid airmen have to ‘dogfight’, to save their butts.
The A2A missiles of the Vietnam Era are not even comparable in capabilities or reliability. Todays AMRAMM hits 95% of the time and the AIM-9X does too. Also modern A2A radar guided missiles are fire and forget, the pilot fires it and them missile hunts down the target with its own radar. In the Vietnam Era a pilot would have to fire the missile then keep the nose of his aircraft pointed at the target so the missile could home in on the reflected radar returns.