That's what I gathered. Since D3D9On12 compatibility is supposed to be complete and supported by Microsoft themselves, and DXVK compatibility is hit or miss but

That's what I gathered. Since D3D9On12 compatibility is supposed to be complete and supported by Microsoft themselves, and DXVK compatibility is hit or miss but much higher performance, they're whitelisting popular titles that they can validate for DXVK on Windows. It's the right approach. There's zero sense in writing a DX9 driver today. Not with the performance you can get out of DXVK. Most of the remaining popular games on DX9 will be moved to native Vulkan or DX12 at a point regardless.