Shin Placement
I’m not too sure where this started, but I have a pretty good idea. Many times the taller, thinner lifters are the best pullers, and they do start with the bar very close to their shins. But if you look at them from the side, they still have their shoulders behind the bar when they pull. This is just not possible to achieve with a thicker lifter.
If a thicker lifter with a large amount of body mass—be it muscle or fat—were to line the bar up with his shins, you’d see he would have an impossible time getting the shoulders behind the bar. Remember, you need to pull the bar back toward you, not out and away from you.
So what I believe happens is that many lifters look to those who have great deadlifts to see how they pull, then try to do the same themselves. However, what they really need to do is look to those who have great deadlifts and who have similar builds as them and follow their lead.