I was under the impression that most of the consumer hardware that has been dominating the scene over the past couple of decades has firmly been dictated by constraints pertaining to IBM PC compatibility. It's only with smartphones and tablets coming in to overtake the microcomputer/PC (though they still have a long way to go until self-hosting and everything) that this is being challenged.
I wouldn't go so far as "dictated", since that architecture has heavily evolved over time; PCI, AGP, PCIe, USB, VGA, and many other standards all occurred long after the dethroning of the IBM-branded PC.
And there's IBM's MicroChannel the ignoring of which greatly contributed to the continued growth of the PC industry as it shifted to 16 and 32 bits as standard.
