So even the existence of the mall does not change gameplay, but throwing an orc warrior in an alliance dungeon group will kill the game. Got it.

To be fair, I haven't seen any server that did it and it was the reason they vanished. As you said, the servers that disappeared were going to whether it was implemented or not. The first private server I ever played had cross-faction raids, dungeons, etc and it actually was good for the server, and...