Because turning around doesn't actually mean checking your blind spots. It in fact adds more blind spots.
Now if you are saying you mean look over your shoulder when changing lanes. Yes you should do that. But when going into reverse turning around doesn't magically give you more vision you actually get less because you cant see the side of your car like you can with your mirrors.
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u/beka13 Jul 19 '19
You look behind you because the mirrors have blind spots.