We're all at different stages in the game, and many of us are scattered across different servers. Would be nice if they had a cross-server party invite, it honestly would make sense given that the majority of the game's grouping is done through the Duty Finder.
I do have a Free Company though, though it's a small one and not everyone is level 50 yet. I'm sure when they all hit 50 we'd have no issues killing Titan, I'm mostly just trying my luck with the Duty Finder while they're grinding up. I'm not in some kind of obsessive hurry to get my relic anyway, given there's honestly not much to do in the game after that. I spend most of my playtime doing gathering and crafting.