The 128K Mac had a lot more memory than most other computers in 1984
They very issue where Byte shows the Macintosh had a lot of computer ads with PC's starting at 128K and being expandable to 512K or 640K. The Macintosh was under specified in memory compared to non-GUI PCs of its era.
Oddly, within a few years people had shoehorned GUIs into much smaller machines, such as
https://en.wikipedia.org/wiki/GEOS_(8-bit_operating_system)