i agree. there's something more robust about pencil lines. the clone picture i did, i used pencil exclusively until i photoshopped it, and i left the shading lines. i have some inked stuff i colored on the comp, but it looks more like cell animation unless i use photoshop effects to the extreme.
for example, these were inked and colored...


(500g for nelo's birthday if you guess the reference used for this PX )
this is heavily photoshopped:

i'll probably photoshop this heavily. you notice it looks different (and slightly better) each time i do it... i'll add shadows and better lighting when i finish the line drawing. so far what i've shown has been purely for demonstration purposes.