Cause it should be applied to everything? At the very least the trees, I can see grass being overkill on fps for affecting GI, which is why I suggested just going for screenspace directional occlusion/raytraced reflections and calling that good enough. But ideally you’d have it affecting everything equally.
But I suppose since it’s not been updated the low sampling is still there for foliage getting contribution from DFGI. Which is why you just clump foliage/particles/etc. into boxes and take samples from the center.