I'm not sure sure you can blame it all Nvidia. The versions that Microsoft ships are written by Nvidia, yes, but they're torn down to essentials with a bunch of features removed. Among those, Nvidia's various control panel type addons, and apparently some important OpenGL extensions that LWGL relies on.
By going through WHQL, Nvidia gets to have better out of the box support on Windows, and Microsoft gets to ship a stripped down driver without Nvidia's control panel cruft and with better support for DirectX than OpenGL.
I don't see what Nvidia's motivation for the last part is unless Microsoft said "Don't bother including all of the OpenGL capabilities, DirectX is fine for basic drivers."
By going through WHQL, Nvidia gets to have better out of the box support on Windows, and Microsoft gets to ship a stripped down driver without Nvidia's control panel cruft and with better support for DirectX than OpenGL.
I don't see what Nvidia's motivation for the last part is unless Microsoft said "Don't bother including all of the OpenGL capabilities, DirectX is fine for basic drivers."