Because Battle.net is the official server. There is not anything else behind that.
As for the models, why is it that much of a big deal to you? The map will be designed for an enjoyable time, while seeking out for the quest's rewards. The models don't really matter. All that is required is for the players to be fully aware, at any given time, of what their skills do and use them effectively in the boss fight. The rest should not concern them.
Finally, regarding the dates, I won't be the one to determine them, I will ask the given groups what dates they mostly find available to play on.