When I joined the internets some 20 years ago, nobody would care if you did anything to a 1978 Fender. The consensus was that pre-CBS instruments were the gems, to be preserved in as-built condition if possible. Some early CBS-era instruments were also seen as good, but you had to hunt them out. Then the Overton window shifted. Stuff from the late '60s and early '70s suddenly had the potential to be good, on occasion. You had to find the one in ten that played as nicely as a hallowed pre-CBS gear.
Interesting that stuff from the peak wilderness years of Fender is now considered valuable enough to cause some pause before modding. Then again, London's Calling, Rocket to Russia, No more Heroes etc is all stock '70s P Basses...