The reaction time of a human, and a video game character are very different. A human QB will never make a throw within 0.1 seconds of snapping the ball like you can in Madden. That is what I consider an "instant throw". It takes more time for the WR and QB to both see what the defense is doing and make that slight adjustment.
Also, a QB will never hike the ball and run parallel with the LOS like I've seen in Madden. They will take a few steps back and rollout.
To me, the forced drop back will make you take the initial steps without being able to do those things.