the vast majority of those still on windows 7 are neither gamers nor have the hardware to run this regardless of the OS.
Source?
Besides, from steam stats (source: https://store.steampowered.com/hwsurvey/Steam-Hardware-Software-Survey-Welcome-to-Steam ), we can see there is more Windows 7 users than AMD GPU users, so by your logic that means they should not make the game usable on AMD GPU?