"I could do that Rainbow, but there are a lot of variables to consider. I have to know exactly where I'm going, and to do that I need to have been there before, or make several smaller teleports in my line of sight. The Map is a better option since it connects to everywhere in Equestria with stunning accuracy. There are other things to consider as well. What if I'm not around? And even if I did teleport you all, I'd be so drained I wouldn't be of any help to anypony."