missing with LT and QB is more painful

If the player isn't as good at other positions, maybe they can still get on field (CB, WR, LB, DE) and be part of a rotation.

But you simply don't want to rotate at QB or LT and when you pick a bad one, you are playing a lesser player all the time at a key position.

A defensive end miss and maybe the guy just plays on passing downs and can still contribute. but not at LT.