It's not backwards. When you are building optimized decks you always want as many copies as possible. Thus reducing the number of different cards you include. These are for competitive decks.Don't you have this backwards? In beta you could have single, double, triple bronze.. whatever you wanted. Homecoming forces you to have only 2 bronze and limit your deck's synergy. Its huge reason why so many decks feel incomplete.
Again, in MTG you must have 4 of a kind to draw the card you want more often. You build your deck around a specific strategy so you won't put singlets in there unless you have to. (Mythics in MTG or gold silver in beta)