I disagree with this one.Fumbling out of the endzone should not be a touchback. In no other situation is the ball awarded to a defense that didn't recover it. Take it back to the spot of the fumble.
I think it works like a punt, the runner lost the ball and it went into the opposing EZ. comparably, if the ball is fumbled at the opposite end and goes OOB, it’s a safety with no recovery.
I don’t think this even happens enough to make a deal about and that last game (maybe college) about a week ago was the first time I ever saw outcry for this one.
I think it’s a good rule and should stay as is.