On that same page I also strongly dislike the rule adjustment where non-commander specific color can now be produced in a deck. That was a very flavorful rule and I still can't fathom why on earth it was changed.
I realize this is slightly off topic, but they explained very well why this was changed. It was changed because it was dumb that a City of Brass or Mana Confluence or Birds of Paradise (or whatever) could be used to cast a Kozilek, the Great Distortion in any deck except a 5 color deck. The introduction of colorless costs prompted the change.