You also have a 4090. For those of us with older Nvidia GPUs, the DX12 experience is almost always sub par.Nah, DX11 is bad. I literally tried the Callisto Protocol with it, and the stutters are still there... performance can even be way worse due to bottlenecks with that API.
DX12 is almost universally better than DX11 for me these days. When DX12 is implemented properly, it simply provides a better experience...
Of course this likely comes down to developers always putting more optimization effort into recent DX12 code paths than DX11 if the game happens to ship with both.
I'm sure I'll get some hate for this post, but it's been my experience for a while now.