I guess the normal artefacts on specular reflections in EEVEE is related to a limitation of the EEVEE render engine. It looks like this:
Under some angles it looks like the material is wet, even when you bump up the roughness 100%.
Above is a grass texture from Quixel, but it happens with all textures in different Blender verions.
Is this a know limitation or issue, and any idea where we can find some background info about it?
Update: I found some more info here:
So as far as I see it’s on the to-do list.