The NFL adjusts the rule defining a catch. Rather than simply make a “football move,” a receiver must establish himself as a runner in the field of play, having control of the ball and both feet in bounds.
Once you go down that path, it becomes more subjective. What is, what isn’t a football move. We’re not talking about a lot of plays over the course of the five seasons since the Calvin Johnson play. This allows us to consistently officiate the rule.