Reading the specs doesn’t give you much of a story. As the article talks, around 1986, software availability became the prime driver of platform sales. That meant taking a different approach to designing hardware. It takes a long time to figure out how to work with custom chips well, which is why the Amiga is still popular in the demoscene, but also a contributing factor for why there was not as much software available when it came out.
Macs and PCs are pretty boring by comparison. A CPU, some memory, interrupt controllers. But they had software. Macs had educational discounts back then (and still do, but not quite as dramatic).