So two identical plays except that one goes 45 yards to the 5 yard line and the other goes 49.5 yards to the half yard line. Which is a better play?
Now take that situation and add a fumble to the end. The 45 yard play the fumble goes out of bounds at the 4, the 49.5 yard play the ball goes out of bounds through the size of the EZ.
The better play (4.5 yards longer) results in the other team getting the ball. The worse play results in a 1st and goal at the 4.
You can't even argue that the defense did something better in the fumble through the EZ. In both cases the induced a fumble (best case for the D...the player could have simply lost the ball, which I have seen), but the one they get rewarded for they gave up more yards.
If you think that makes sense, more power to ya.
We could all come up with interesting hypothetical examples (and attach logic which may or may not be flawed). Bottom line, the end zone has different rules, like the goal/basket/net/hole of many sports. That's the basis for the different rule. You or I may not like the rule...but that's the basis for it.