Some people like to be apart of their own FC with their own tag but want to benefit from being apart of a larger FC. FC Alliances allow people to keep their tags, while being apart of a bigger community. Same concept of a LS, but this could, and would ideally keep your "community" more active since, at the moment, keeping a LS full of live members is quite the chore, especially if you don't record how often people log in and play. A FC can do that by default, and wouldn't take up any player slots. FC alliances allow for FC individuality while allowing players to emerge into a more active community with other free companies of their choosing.

I don't see why anyone would be against growing their social circles. This game is hard enough to "make friends" since you could ideally DF nearly everything and never once talk to a single person on your server.
I don't understand why anyone would be against this.