“Interestingly, many of the bigger changes reached the threshold that Wizards considers to be a success – a 70% success rate. "The thing is, the scores are not the full story," Crawford said. "We also look at what are people saying in the written feedback and what they are saying in online discussion forums. And while people were often excited by a number of these experiments, there was also a lot of concern about what would this do to the existing game."”
so they should have iterated, and instead threw them out because there were some loud naysayers, great. I positively hate this process.