Does anybody in the industry know why there was a push to move away from specific role planes that excel in one area to ones that can do any area decently? It'

Does anybody in the industry know why there was a push to move away from specific role planes that excel in one area to ones that can do any area decently? It's the same disease that McNamara caught, resulting in the F-111. The F-111 was supposed to be the super plane for the Navy and the air superiority platform for the Air Force. Synergistic with this is that idea that there would be no more dogfighting and it would all be done with missiles. Tactical data sharing, complex systems like missiles, and the infrastructure which supports them all involve a lot of planning. No plan survives contact with the enemy.