the DXVK project out of all this has been a godsend for the older DX11, DX9 games on modern hardware, its being used to increase FPS on older titles on windows
Isn't Intel even shipping DXVK on window for their shiny new GPUs as it is often works better than their DX9 drivers?
Yep. Their driver switches which DX9 implementation based on which game is running, according to which they've observed has better performance.
The promise is that they start targetting Proton or devices like the steam deck in particular.
They already do that by targeting Windows, and letting Valve do the work, no need for more development costs.