Why are be being forced to choose what era to play in?

[Piper-shadowsong]

@Frosto-faerlina

@Frosto-faerlina

We know:

• It will be called World of Warcraft: The Burning Crusade Classic
• Content will be in phases, with pacing catering toward the Classic community
• Decide whether to advance to TBC Classic or continue in WoW Classic before the release*
• Able to play with a WoW Subscription, and no additional fees (same as WoW Classic)

The way it’s worded is confusing: https://classic.wowhead.com/news=320973/burning-crusade-classic-confirmed-in-blizzconline-leak

• Choose Your Era – Prior to Burning Crusade Classic’s release, WoW Classic players can decide whether to advance each of their characters to the Burning Crusade era with the rest of their realm, or to continue playing the original WoW Classic content on new Classic Era servers.

Obviously, this “Era Choosing” seems to relate to before BC Servers…but, is that like…after it’s released, as well?