If RTX features aren't important why not just use Windows 8.1? Do any e-sport games only work on Windows 10? You can use Windows 7 drivers on Windows 8.1. I think they are the same drivers. NVIDIA just doesn't want to support 8.1 anymore because few people use it.
I think Windows 8.1 is better for games than any build of Windows 10. Mainly for games that don't have a good DirectX 12 implementation and run better on DirectX 9. Although I didn't find many comparison tests. But Win8.1 is the most responsive and optimized Windows overall. Windows 7 is lighter but RAM consumption in games on it is the highest and 8.1 handles disk operations better, among other optimizations.
If you are going to use Windows 10 better use version 2004/21H1 due to DirectX 12 Ultimate which in the long run will greatly improve performance in games if developers implement the optimizations that came with it in their games.