Dropping support? No, said support was announced to not exist before the release of said CPUs, and given that CPUs are a fair bit more complex than appears (for

Dropping support? No, said support was announced to not exist before the release of said CPUs, and given that CPUs are a fair bit more complex than appears (for instance Windows XP wouldn't run on Ryzen CPUs until a microcode update in practice due to some old feature being unsupported, or new features would be introduced that old OS task switching code is unaware of) at first glance, it was considered unviable to formally support these CPUs - even if they might work at first appearances, Microsoft gathers sufficient usage/error data that they presumably know of some hard-to-fix issue that makes it impossible to guarantee the OS to work together with this new hardware. Also, an update to the OS to make it compatible could potentially be sufficiently high-impact that it could break user applications, existing hardware functionality, or other potential concerns.