Ban on Brainstorm: Yes or No (Post Snapcaster Mage)

[Roman Candle]

Riddle me this: if Brainstorm is so powerful for blue decks, then why does the only competitive mono-blue deck (Merfolk) not use Brainstorm in more than 19 top eight decks in the past 4 years?

Hasn't this been answered ad nauseam in the other thread? Merfolk should be playing brainstorm and just because people top8 without it doesn't mean its optimal.

Also when the hell did "blue hater" become an offensive name?