Some people really feel that, in a game where there is only instant communication across short distances, an instant chat system across the galaxy to your friends just throws the entire purpose of short range communication only, out of the window and whilst not game breaking is somewhat immersion breaking; it..spoils it; for want of a better term.
I think therein lies the rub of the problem. I don't see ED as a multi-player game; I see it as a single player game with multi-player elements (and I know I'm not the only one). I see it as thousands of Cmdr's going about their own business in the galaxy, impacting it in their own way. Thousands of individual solo experiences sharing the same galaxy. Thousands of solo's who can choose to work together if they wish. Pretty much like life, lol.
Imagine WoW, right - but without the raids, or the roles, or the dungeons. A world in which you can live and go about your e-life, doing what you like. Farming, trading, soldiering and so on. That's kinda like how I see ED.
It's MP in the sense that we're all in the same place, but we're meant to "blaze our own trail!"
And, I think, this is where the issue of a GalChat (

) comes in; it breaks the idea of ED systems being separated and independent from each other; where communication is ultimately spread around through the ebb and flow of mankind as they move about space, or through short range communication buoys.
I don't like it. My preference would be for something like this: [ Unable to establish a connection with Galnet: You are outside of Galnet communication range ] when you attempt to open GalNet when outside of human space.