I’ll tackle the graphics question…
Initially there has been an emphasis on supporting the stylized look of FN, but we also want to pave the way for more photorealistic experiences. Creators can use the M_EpicBase_Parent material as a foundation or create their own, and combine this with custom lighting using captured HDRIs. The following video by William Faucher, even though it’s focused on UE5, touches upon several lighting concepts that can help achieve a more realistic look: Lighting in Unreal Engine 5 for Beginners