Is that a list of games that only support DX12, or a list of games that support DX12 and possibly some other API as well?
It's both.
Okay, so how about a list of games that only support DX12, since that's what's being discussed here?
The link lists both games that only support DX12 and games that support DX12 and something else.
Oh, also, Dx12 does offer performance benefits: https://en.wikipedia.org/wiki/DirectX_12#DirectX_12