Many specialty printers are Windows-only.
PostScript has been a staple of the graphic arts since its inclusion with the Apple LaserWriter printer launched the desktop publishing revolution in the mid-1980s. For any business that prints a lot of graphics, a printer with a PostScript driver (or at least PostScript emulation) is a big plus. You can print graphical material with text made in these programs from non-PostScript printers, but at a potential loss of quality, including occasional dropped elements and formatting. Illustrator, as well as Photoshop and Acrobat, are optimized for Adobe's own PostScript printing language. Macs are widely used by publishing professionals and graphic artists who rely on Adobe programs, such as Illustrator, to ensure the best output quality.
Nearly all new network printers are Bonjour compatible, though very old routers may not support it.
(It is also what lets AirPrint identify compatible printers on a LAN.) You can set up a printer without Bonjour, but its presence simplifies the task. Bonjour allows users to quickly discover devices, including printers, on their networks. One item worth mentioning is the Bonjour protocol, Apple's implementation of zero-configuration networking, which is built into macOS Mojave, all OS X versions going back to 10.2, and iOS (and can be installed on Windows, Linux, and BSD systems as well).
