There two physically different version of M.2, one that only supports SATA III drives, and another that supports SATA III and NVMe. Some, mostly early, M.2 slots don't have as many pins as the ones that support NVMe.
Yes, Apple was the first to put PCI-E mini cards into a consumer product, no doubt that. Intel had full size PCI-E cards for workstations out before that, not that the speed of the drivers were as fast as those supported by NVMe, then again neither were Apple's. What I disputed was the statement that PC makers were still only "band-aiding" 2.5" SATA SSD's into computers, which is just outright false.
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