I heard that Blizzard was flooded with complaints about the difficulty of the candy achievement, to the point where they eventually upped the drop rate, but it was too late for a lot of people.

I'm getting the idea that the metas are aimed at the hardcore, the people who play A Lot. I mean, someone at Blizzard must have sat down and run some quick probability stats to work out how long it would take to do the candy combos before they implemented it, right?