Here’s a good example of why I continued to use the “tracing paper transfer” technique. (Other than the obvious benefit of being able to… you know… trace stuff.) All of these roughed-in lines and perspective lines and otherwise unwanted lines would have to erased had I done them on the illustration board:
But by working out all that stuff on the tracing paper and then transferring only the lines that I intend to ink, I’m left with a nice, clean, smudge-free image to work on with very little-to-no erasing needed once the inking is done: 
Which is a very good thing as sometimes erasing would lighten the inks from black to various shades of grey, severely affecting its ability to reproduce properly.
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