What no one seemed to ask at Blizzcon!?

Even the account-wide systems have limitations/exceptions, and most are based on the idea that you're still playing individual characters that are making progress within the world they inhabit. Making various systems account-wide is obviously convenient and time-saving, but it can have a downside of reducing attachment and meaning for the actions of your individual characters. Despite some player's intent to reduce the game to its core systems, we do still hold that this should be an immersive roleplaying game, and that your character's actions aren't just numbers or an entry in a database.

In quite a few cases we're ok with sacrificing some character individuality for the sake of convenience, but even with those there are exceptions where achievements/mounts/etc. are character-specific. We don't really want the game to be a platform where you swap characters in at out at-will because there's no difference between them except a skin and set of abilities. Ideally you're making an alt because you want to play them.

So, in-short, we prefer that reputations are an enjoyable way to track your progress while playing, or something earned by a hero that so impressed a faction as to gain their highest esteem and reverence, and for those reasons we have no intention to make reputations account-wide at the current time.