>>3815819when you shave (with a razor), you don't only shave hair, but also exfoliate the outer layer of death skin, which is why the skin feels and is more sensible after shaving
when you do clean lineart, you dont only redo the lines better, but also remove the faint shading created by repeated lines
also this
>>3815829. if your drawings are bad, drawing more lines in a place makes the drawing more vague and lets the mind fills in or chose the correct line
