If the game state dictates that youre better off casting it (like Kozilek, Butcher of Truth) or keeping it in your hand (if the environment is currently hostile to the permanent type), then you have the option
For example, creature tokens and The Monarch tokens are cards you cant play in the deck but provide clarity and help keep board states legible
First, it takes longer to exhaust a larger supply of sealed product, but more importantly, the larger a sets print run, the less rare the individual cards are too, which tends to lower the price of a sealed product
There are a few notable cards in this deck that players will want to take full advantage of
(And yes, Narset was only one of the problem planeswalkers from War of the Spark, with Teferi, Nissa and Karn all being bad as well