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> Don't forget that the Macintosh was preceded by the Lisa (800x364) and the IIGS (640x200),

Lisa was January 1983

Macintosh was January 1984

Apple IIgs was September 1986

The IIGS came out well after the original Macintosh: https://en.wikipedia.org/wiki/Apple_IIGS

The Lisa was also about twice as expensive as the Macintosh which is why it failed hard. So the price limited the hardware and that caused this display bandwidth constraint.