NFL will look at the fumble-out-of-end-zone rule

faceman said

The ball never had to touch the ground to be a touchdown. All it ever had to do was break the plane
where the white stripe began. It never had to make it to the green area of the end zone.

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But in rugby, you still have to touch the ball down, and if you fumble it through the Try Zone, then it's the other team's ball. I don't see why we need to change the mechanics. No upside - just a different rule that takes this game further from its roots.