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The preference of the player base is a significant factor too

The Forces of the Imperium Universes Beyond: Warhammer 40,000 Commander Deck set includes 1 ready-to-play White-Blue-Black deck of 100 Magic: The Gathering cards (2 legendary traditional foil cards, 98 nonfoil cards), 1 foil-etched Display Commander (a thick cardstock copy of the commander card with foil etched into the cards border and art), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 life tracker, 1 strategy insert, and 1 reference card.

For instance, a deck built around morph, which involves playing lots of creatures that cost three mana, will likely play more 1mv ramp spells, just like a deck with a commander that costs three mana

In fact, more than half of the cards involved in this update got Human added to them. The article cites Samite Healer, a card that was originally a cleric but is now a human cleric