I thought his mistakes happen when the receivers run the wrong routes or don't catch balls that hit them in their hands and when his offensive line allows defenses to treat him like a pinata.
Thanks, Jason, for letting me know its because Romo isn't trying to just be 1/11th of the offense. Put 10 other players on the field worth being there and maybe Romo can afford to be 1/11th of the offense.
"'Room' always makes me chuckle. That's irrelevant. What we have on a given day really doesn't relate to what you're ultimately going to have and how you're going to manage."
Stephen Jones on salary cap limitations