PM people in dungeon

[Souljacker]

I doubt /tells are that much harder on the systems than the FC and linkshell chat that can already go on. I suspect that it's due to a different problem:

/tell "John Doe" Hi
would be confusing if there's both a John Doe there in the dungeon party with you and also a different John Doe back on your home server. No matter which one they implemented, there would be people trying to use it to talk to the other John Doe.

It's wholly unique to SE games then, because other games have managed to figure it out. I cannot think of one other game that blocks you from communications just because you jumped in a dungeon, and two of those I know for certain have had cross-server for years. They invented it.