Straight from the horse's mouth (politely): the Panthers are handicapped wrt QB sneak.
"A lot of teams would go for a QB sneak on fourth-and-inches in enemy territory. But the Panthers have yet to try that during Young’s three-year career in Carolina.
According to Canales, the decision to not use Young on QB sneaks is about physics.
'He goes about 190 pounds,” Canales said with a shoulder shrug. “And when you have a 220, 230-pound quarterback leaning on a center, that’s an advantage. When you’re not putting a bunch of force that way, I don’t see that as an advantage.'"