Let's talk about Harris's catch.

[Amnorix]

Originally Posted by O.city

If he has 2 feet down and controlled the ball in the endzone the play is dead. You said so yourself

So yeah, had this happened in the field of play by that, it would be a fumble

But today's catch no catch rule is about as clear as mud

Agreed that the rule isn't easy to understand, explain or apply, but it definitely isn't just two feet down and control of the ball. You have to "complete the act" of the catch which includes "surviving the ground" if you go to the ground.