I was busy doing some research if FFXIV game developers will implement directx12 in the future. Sadly I couldn't find much info.

The only thing I found was that heavensward release wouldn't contain directx12. I hope in the future this will actually be implemented, because on some low/medium end systems FFXIV runs really bad, even with everything on low.

Doubt anyone know the answer, so just sharing my opinion with it