Yes, when Peter Pritchard sold ADC off to BSR in the late '70s, it was inevitable that the former's products would be dragged down.
What many likely don't know is that Pritchard is credited by General Electric as the inventor of high compliance induced magnet phono cartridges (what GE marketed as 'variable reluctance' in the late 1950s, with a patent for same filed May 2, 1960 that acknowledges Peter Ernest Pritchard as inventor). The ADC-1 cartridge was a game changer that allowed for flawless tracking ability at .75g VTF!
Even lesser known is that Peter also invented the modern low mass, low inertia tonearm in order to provide an ideal carrier for his own cartridge. His Model 40 (originally sold as The Pritchard Pickup System complete with ADC-1) featured a 4-point gimbal ball bearing, thread and weight anti-skating mechanism, tapered cross-cut hardwood main beam, and removable plug-in headshell; all available on the market just in time to perfectly track Miles Davis' then just released 'Someday My Prince Will Come'.