I, for one, aside from collecting cards, want to learn how to play the game
While giving your opponents extra resources sounds bad in a vacuum, Commander is a political format where doing so can actually turn into an upside
The codes will not grant the exact same cards that come in the physical boosters, but six randomized ones from the collection to which they belong
While you can tune engines to draw extra cards and control the game, some tactics are simply more consistent (bunnies can easily overwhelm an opponent, for example, thanks in part to the new Offspring mechanic)
Not just limited to the plane's five castles, there are as many stories on Eldraine as there are people
Because colorless mana rocks that produce multiple mana are more popular than ones that produce mana of a specific color, they synergize well with very expensive colorless creatures or spells that can have a big impact on the game