The only reason we have to use hatches is to make surfaces printed black and white distinguishable from each other if they represent different product. Color PDF looks fine 'cause you can distinguish them by color, but when you print grayscale paper set - same “brightness” colors are printed the same hence use of hatches.
That wouldn’t be a problem is Rhino rendered hatches infront of the surfaces if they are coplanar, but sometimes Rhino gets confused and you have to go back to your model and move hatches millimeters infront of the surfaces to see them in detail views. That’s very annoying and time wasting.
^ It looks something like this.