A server core cannot communicate with the game without matching geographic data extracted directly from the WoW game client.
When downloading a Dragonflight repack, keep the following development statuses in mind: What Usually Works Perfectly
However, Blizzard may also release an official “offline mode” for WoW in the distant future (similar to what some other MMOs have done). Until then, repacks remain the only way to truly own your WoW experience.
Run WoW.exe (not the Battle.net launcher). Log in with MyUsername and enjoy the Dragon Isles—without ever paying a cent.