Alliance locked on 3 realms. How come?

[Saneko-ragnaros (Saneko)]

If Alliance > Horde population, Alliance remains locked until Horde is filled up a bit. Vice versa.

Edit:

Including the developer philosophy here as well:

Realms Expectations for Season of Discovery

Hey everyone. I’m Fwoibles, also known as Tom. I’m a Senior Producer on the World of Warcraft Server and Live Ops team, and I would like to share what we’re preparing for the realms with the upcoming launch of Season of Discovery. You may have noticed with the launch of Classic Hardcore that there weren’t a lot of realms. Was Hardcore’s launch a small experience? Heck no! Hardcore continues to be experienced by a huge number of players, and we have been thrilled to see so many players, new and …