From a psychology perspective, it's certainly not. People tend to think with the "spotlight effect", meaning that they believe their actions are more visible than they are. They tend to interpret messages directed at themselves personally even when they know they're not. People also have an aversion to loss more than they appreciate a gain. All of this means that many people will feel aggrieved and publishing this will help the situation in some way. There's also the benefit one gets from just expressing one's feelings.
What would have been BioWare's best move, from a "psychology of the customer" perspective, would be to start "sneaking" people on early. That way, people would still be expecting the 15th, and would be happy to get in before that. Probably that is logistically impossible, so their next best option would be to inform people what wave they are in. While people would still feel anxious, giving them something more concrete to focus on would be beneficial. BioWare doesn't know when they will admit their waves, but if they are admitting them based on the order in which they received code redemptions, they should already know where individual accounts fall on the wave distribution.
Of course, that would mainly lead to a different time of post- "I'm wave 8 and they're on wave 2- why are they going so slow!!!" However, I think those grievances are more manageable for people than the greater degree of uncertainty that the low-information current approach is generating.