It sounds like there are some legitimate concerns when it comes to the implementation of multiplayer functionality, and some very good community ideas around the limitations. I do hope that some of the ideas mentioned make their way into the game. I've also noticed people mention that when they communicate through external voice chat options, they are able to coordinate effectively enough. Since that is how I intend to communicate with my friends when they start playing, I find that a relief. I was concerned it would be as annoying to meet up as in DayZ, where you essentially have no ability to group at all within the game and everything is done through outside organization.
The impression that I got from the earlier trailer and the recent event video showing the capital ship battle, was that calling in nearby friends for some group battles would be reasonably seamless. I have to assume FD would be aware it was being perceived this way, and intend to fulfill that expectation.