macOS sees quite a lot of change under the hood from release to release that can make bringing unmodified drivers forward impractical. For example, in recent re

macOS sees quite a lot of change under the hood from release to release that can make bringing unmodified drivers forward impractical. For example, in recent releases there’s been a push to move drivers away from the kernel and into userspace, which is naturally going to break old drivers. 32-bit support was also dropped not too long ago, which broke old 32-bit drivers.