NextStep licensed Adobe's Display PostScript for it's graphics subsystem, but when MacOS was developed Apple replaced Display PostScript with an in house implementation of the open PDF spec that they called Quartz 2D.
> Quartz 2D is available to all macOS and iOS application environments and provides resolution-independent and device-independent rendering of bitmap graphics, text, and vectors both on-screen and in preparation for printing.
The drawing model utilized by Quartz 2D is based on PDF specification 1.4.
NextStep licensed Adobe's Display PostScript for it's graphics subsystem, but when MacOS was developed Apple replaced Display PostScript with an in house implementation of the open PDF spec that they called Quartz 2D.
> Quartz 2D is available to all macOS and iOS application environments and provides resolution-independent and device-independent rendering of bitmap graphics, text, and vectors both on-screen and in preparation for printing.
The drawing model utilized by Quartz 2D is based on PDF specification 1.4.
https://en.wikipedia.org/wiki/Quartz_2D
So now both Adobe and Apple have dropped PostScript in favor of PDF.