Also just to add, the filtering is not a "shortcut"; it is a deliberate thing done to reduce flickering and fireflies, especially in animations. Most if not all render engines do some sort of filtering, for the same reasons. Anyway, there is now an easy way to remove it using "None" (previously, lowering the Blur setting in the map to 0.01), this is where you might get flickering and fireflies in animations, but if not then you are free to use it :) And now if you do need some filtering to avoid problems, you can choose the new Roughness Modulation to see if that gives you preferred results compared to the old (still available as an option) Linear.