The key seems pretty pointless. I disable cortana anyways so idk why i’d want a key for it lol. It’s other function is search apparently but I already use the win key for that
It's a standard that Microsoft maintains. Like, "This is what keyboards for our platform should look like." The only real place this gets enforced is laptops and maybe keyboards bundled with towers running Windows. It's part of the requirements to get the little Windows sticker on your product and allows you to market the hardware with the OS. Beyond that, other manufacturers will usually implement the standard just to be on the same page.