Considering the fact that the CPU in your typical dot matrix printer will be the cheapest and weakest 8 bit MCU the manufacturer can find I'm not sure that's much to crow about.
(A typical full-featured Centronics printer of the same period would use something like an Intel 8049, a device best known for living inside IBM PC keyboards. The Epson MX-80 used a low-clocked 8085, a more-integrated and easier to use descendant of the 8080 inside the 1975 Altair 8800.)
It does stand out as a very typical example of Apple's brand of engineering at the time, IE, rip all the brains out of a peripheral, substitute a dollar's worth of hardware and some beautifully handcrafted (read "really ugly") 6502 code, and charge roughly what the peripheral would have cost with the brain still in it. Step 3: Profit!
(With Apple being the only pre-1980 computer manufacturer still in the fight I don't suppose you can argue with the success of that strategy.)