NFL scouting and coaching has come a long way in the modern era. Analytics and evidence-based decision making has improved how some teams approach both in-game play and roster moves. Backfields, once primarily controlled by a single player, have been split into committees with multiple players filling specific roles. Offensive schemes maximize talent with zone and gap reads for wider lanes. And a quarterback's build is no longer a make-or-break proposition.
Once upon a time, quarterbacks were cut from the exact same mold, something around 6'4" and 225 pounds. The belief that a quarterback should meet specific height and weight requirements has given rise to several narratives, two of which stand out most prominently.