FSR 2 is DirectX 12-only right now. Several users that would benefit from FSR are using older GPUs that do not fully support DirectX 12’s newer features or have a lower amount of VRAM (usually in the 4-8GB range). With DirectX 12 requiring bigger VRAM amounts to run smoothly, it would really help if FSR 2 support was enabled for DirectX 11 mode as well.
From AMD’s official FSR 2 page:
Developers interested in using DirectX 11 should contact their AMD representative about this topic.
Since Asobo are in constant communication with AMD, just like they are with NVIDIA, DirectX 11 support should be possible if they collaborate. Please consider it if it’s not too much effort.