Primarily, newer sets are more available and generally less expensive than older sets
Preventing all noncombat damage that would be dealt to you and creatures you control is huge as well
Each pre-con product is designed to ensure you can crack it open, shuffle the cards, and start playing straight away, and these Commander decks are no different
Funnily enough, I had a quick look at the Cloudpost deck that made the Top 8 of the very first Modern Pro Tour in Philadelphia back in 2011, and the deck contained four cards that are now banned Cloudpost, Eye of Ugin, Green Suns Zenith and Punishing Fire
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The deck is very fast and can get out of control very quickly if no one does anything to stop it