You make it sound like the gamedesigners are not interested in this feature because they would not make money of it. Sure it's a cheap game, but don't ya think this easy to implement feature will give newer players a better understanding of the game mechanics? Thus they find it more enjoyable, meaning more people will keep playing magic? I think they missing a great opportunity to keep their userbase happy, and give them the insights to get hooked.
That's because I'm a realist. They don't want people to enjoy DotP, they want them to enjoy Magic: The Gathering.
Magic is the end goal, not Duels. Learning more about Duels means they're playing Duels for longer and also learning more about how to play Magic wrong.
If people want to learn more about rules interactions and the intricacies of Magic's game mechanics, they need to play Magic.
It's a good idea, and it would be a cool feature to have. It's just not something I could see on their features list (which over the years has included "May=/=Must", customizable lands, manual land tap, Random deck select, etc).
Also... "Keeping their userbase happy"? Surely you jest.
missing a great opportunity to keep their userbase happy
My good Sir, you have stumbled upon Wizard's new business strategy!
Let's not turn this into a Wizards hate thread shall we? If the option gives them more money and helps people understand the game better, we all win, right?
I honestly doubt "save your game, review your wins/losses from your opponent's point of view, become a better player" is going to sell Duels '15.
"Save multiple decklists and change the AI's decklists" (So you're not testing your builds against decks that are horribly outclassed by your fully unlocked/promo'd deck)...
That might be a selling point for Duels '15.