Re: "see the list of DirectX 12 games"
Agreed, plus DirectX 12 is a nightmare for programmers, it requires so much developer-side handling of temporary resources and gating of existing memory access that it's just not worth it. Your game would have to be physically broken in DX11 to even consider switching. Even the games that do run DX12 (Hitman, FIFA, etc.) actually use DX11 as the interface through feature levels because programmers hate DX12 so much.