Most of the midrange and high-end models at the time did support over 64 MB of RAM (the Centris 650/Quadra 800 supported 136 MB, the Quadra 950 supported 256 MB

Most of the midrange and high-end models at the time did support over 64 MB of RAM (the Centris 650/Quadra 800 supported 136 MB, the Quadra 950 supported 256 MB, etc.). In fact, even the 1987 Macintosh II could be pushed to 68 MB (or 128 MB with a ROM upgrade).