I wonder if DX11 makes virtually no visual difference with >10FPS gains like it did in BF1.
From source page 5: "Much like Battlefield 1, DX11 simply runs better and has fewer stutters. For the above two charts, I ran two cards in both DX11 and DX12. In the lower resolutions, DX 11 will be anything from 5 to 15% faster compared towards DirectX 12. In the highest resolutions that gap closes to up-to 5%, but yes overall DX11 is the recommended API for now. What you see below are the cards tested at DX12, and with the protection active I gave up testing DX11. So overall you can gain let's say 10% quite easily just by using DX11, which is more stutter free as well. Keep in mind, we test with reference cards solely. AIB cards, depending on what you bought and what is factory tweaked, can bring in more performance anywhere from 5 to 20%.
We opt to use DX12 for all our regular testing, purely for the sole reason that DX-R will require DX12. So for a bit more perf, please do use DX11 if you do not own a GeForce RTX generation graphics card."