Of course they would and that is reason why I don't agree with the statement. Even AMD had profile for Valve games that improved performance on their blob and N

Of course they would and that is reason why I don't agree with the statement. Even AMD had profile for Valve games that improved performance on their blob and Nvidia had several different profiles some of which come from Windows drivers: to be exact one for id Software games that was always using OpenGL on Windows. Of course there is open source drivers that will likely never support game-specific optimizations since for them codebase quality and overall performance is more important than few tricks that make specific games faster.