The quarterback position, at every level of football, is going to have some semblance of heavy weight and a bright spotlight on it. It is one of two positions to, on a typical play, touch the ball (along with the appropriately named center). Even a play that requires nothing more than a handoff to a running back requires some effort on it, whether it’s the QB using their voice, receiving the football in some capacity or at least moving their feet in a preordained way. Think of what Matt Saracen went through.
It’s not just the physical requirements — the height, weight and arm strength — of the position that grow higher.