You can think of it this way:
With no Z-levels you can lose your golden ring to some gooey precipice in the ground. Once you manage to get down there, your precious has vanished for all eternity, stuck in-between the debugger’s bits and bytes.
With Superb Awesome Z-Levels (SAZ-L) you get to drop your ring, but you can never lose it. Nevertheless it shines more brightly so you’re blinded with the wish to explore the depths of the Mighty Z-Dungeon. However, the goblin that took your ring was a mere toothpick for the Great Wyrm nesting there, so your Z-Levels actually are:
Great_Wyrm>>Your_Pile_Of_Bones>>Goblin_Toothpick>>GoldWish
And yet another trivia - if Sauron had no Z-Levels, Frodo could’ve been the new Dark Lord. 