Maintaining possession through contacting the ground has been in the rules for ages.
The first big uproar in modern times was the Emmanuel non catch. There they said he used the ground to secure the ball, but the ball didn't even move. The following year they relaxed that part of it, but you still had to maintain possession.
What everyone thinks as the Calvin Johnson rule was actually rule changes made 3 years before the Johnson play. In 2007 they removed having to make any football move. But in doing so, that left a player going to the ground no wiggle room to become a runner. So every catch had to maintain through contacting the ground.
Then they added in become a runner in 2011. Then that was still a huge issue in 2013, so for 2014 they added some more clarification about the time/regain balance aspect. Then that obviously led to the Dez fiasco. 2015 they clarified it even further to replace time with upright long enough. This is where the conspiracy kicks in.
So they have been going back and forth on what is or isn't a catch for 20 years now.
And honestly, it affects less than 1% of all catches any given year. If even that much.
Whatever they do next, I just hope they are crystal clear on it.
Again misrepresenting the facts:
Here are the 2013 and 2014 rules for a catch:
Article 3 Completed or Intercepted Pass. A player who makes a catch may advance the ball. A forward pass is complete
(by the offense) or intercepted (by the defense) if a player, who is inbounds:
(a) secures control of the ball in his hands or arms prior to the ball touching the ground; and
(b) touches the ground inbounds with both feet or with any part of his body other than his hands; and
(c) maintains control of the ball long enough, after (a) and (b) have been fulfilled, to enable him to perform any act
common to the game (i.e., maintaining control long enough to pitch it, pass it, advance with it, or avoid or ward off an
opponent, etc.).
Note 1: It is not necessary that he commit such an act, provided that he maintains control of the ball long enough to do so.
Note 2: If a player has control of the ball, a slight movement of the ball will not be considered a loss of possession. He must
lose control of the ball in order to rule that there has been a loss of possession.
If the player loses the ball while simultaneously touching both feet or any part of his body to the ground, it is not a catch.
Item 1: Player Going to the Ground. If a player goes to the ground in the act of catching a pass (with or without contact
by an opponent), he must maintain control of the ball throughout the process of contacting the ground, whether in the
field of play or the end zone. If he loses control of the ball, and the ball touches the ground before he regains control,
the pass is incomplete. If he regains control prior to the ball touching the ground, the pass is complete
Article 3 Completed or Intercepted Pass. A player who makes a catch may advance the ball. A forward pass is
complete (by the offense) or intercepted (by the defense) if a player, who is inbounds:
a) secures control of the ball in his hands or arms prior to the ball touching the ground; and
b) touches the ground inbounds with both feet or with any part of his body other than his hands; and
c) maintains control of the ball long enough, after (a) and (b) have been fulfilled, to enable him to perform any act
common to the game (i.e., maintaining control long enough to pitch it, pass it, advance with it, or avoid or ward off an
opponent, etc.).
Note 1: It is not necessary that he commit such an act, provided that he maintains control of the ball long enough to do so.
Note 2: If a player has control of the ball, a slight movement of the ball will not be considered a loss of possession. He must
lose control of the ball in order to rule that there has been a loss of possession.
If the player loses the ball while simultaneously touching both feet or any part of his body to the ground, it is not a catch.
Item 1: Player Going to the Ground. If a player goes to the ground in the act of catching a pass (with or without contact
by an opponent), he must maintain control of the ball throughout the process of contacting the ground, whether in the field
of play or the end zone. If he loses control of the ball, and the ball touches the ground before he regains control, the pass
is incomplete. If he regains control prior to the ball touching the ground, the pass is complete.
There was no clarification, that case play was in the 2012 case book too, so from 2012 to 2015 the catch rules were the same.