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First of all, it speeds things up

Cards like Edric, Spymaster of Trest, Toski, Bearer of Secrets, and Marisi, Breaker of the Coil can greatly benefit from creatures with shadow since theyre really hard to block

This means that the deck will play a lot of black tutors to find an effect like this and attempt to discard Haakon with Tortured Existence and the like

The first wave of Brawl precons were actually cheaper, including decks in the 3k-15k range

Free stuff beats card draw at the kitchen table

So, building a deck with the maximum number of pips a single color will maximize the odds your devotion cards are impactful