Lore-wise it clues you into the mind of Yawgmoth, who's now recognized as a person to the possibly unknowing audience, but also makes the player feel as though theyre some sort of dark mastermind themselves
Changing the as-fan of rarities (that is, the count of each rarity of card you'd expect to see when you open a booster), introducing more variance in slots, adding in more "outside" cards, all impact how the set plays and thus requires us to change how we build the set
For instance, "there aren't a lot of colorless instants, so it's tricky giving the deck enough ways to be reactive"
It has better support for its theme, better value overall, and better cards
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The reason why I dont have The Scarab God any higher on the list is because it is still a two-color legendary creature, making it hard to see widespread play