A "sweet spot" is a spatial characteristic of a lens. I assume with sweet spot you mean that the area that provides focus is small. This is not affected by nits, or lateral light scattering reduction to prevent god rays. If anything it results in a clearer better quality optic that prevents the
god rays which you see in a quest 2, without affecting peak brightness due to the higher nits possible with OLED. All it does is prevent some light getting through, it doesn't change the focal characteristics of the lens. ie, the "sweet spot" is unaffected.
Now if people were to say the sweet spot is more difficult with both eyes for a given headset then other factors come into play too, that is a little more believable. I don't see anything that makes focusing on one fresnel lens that different from focusing on another fresnel lens when they have near identical focal distance and characteristics. Preventing scattered light doesn't change your focal characteristics at all. To me this seems like wishy washy claims with no science behind it at all. As I said I bet I can take better images with a cam easily.