Bethesda is using a decades old engine that they've tacked improvements onto over the years. It's never going to make anything as good as their contemporaries using more modern tech can put out. Better looking faces wouldn't do much to fix Starfield or any of the other recent Bethesda titles.
This technology would work a lot better if it were in the middle of the render pipeline so that it can be selectively applied and then other effects can be layered overtop. The main problem is that it's going to be expensive and require additional memory and for the foreseeable future that limits it to the top few percent of the market that can afford the $$$$ GPU that can do it without cratering the frame rate.
