MTG Salvation

That is really simple to explain J. Its based on the spending habits of the collective EDH playerbase. Commander 20XX decks always sell really well. Legends from whatever standard set tend to also sell well. They took it to mean that in order to rope someone in, they should double down on the EDH side of the game to get the average player interested in other formats as EDH-like things is apparently what the player base likes. They also have taken it to mean just print whatever they feel like in Commander precons as the playerbase will just snatch it up anyway, such as Timeless Wisdom having Fierce Guardianship. They also have understood that new Standard players are very likely to take their collections and move to EDH so catering to both tends to work well most of the time, the only time this really blew up in their face was companions. Even Brawl is just the training wheels version of EDH to get people accustom to the idea.