I'm of the camp that Fate does support a more connected form of game world. Creating long term relationships and connections is definitely doable.
Was it the best choice for Bureau 13? Well, I'm still thinking about that. I considered using the Brainstorming
rules from Atomic Robo, which would have given everyone more player agency in what the real mystery was, and definitely change the ending of the game. But it would have stopped the game while everyone was brainstorming up an idea of what was going on. I've gone both ways with my Fate games, brainstorm and sticking to script, and they both are enjoyable.
I will be honest and let you know that this was a published Bureau 13 adventure, so I was in a way, sticking to the script. Or at least to the sandbox. The game didn't have a predetermined set of events that had to happen, and I definitely had to update an adventure that was created in 1984. I had to create all the background information for this adventure, as there was hardly any in the published work.
I think when we do the next adventure, I will make use of the Brainstorming rule. That means the end of the adventure is mostly in the player's hands. It would have to be an end of session thing, about half an hour to do, hopefully, and it would give me a set of "true facts" for me to use to craft the new ending.
And I agree with Dirk's assessments for Weirdzone and Hardwired Hinterland. You are severed from your background and past, but at least with HH, as Wilhelm pointed out, you can create new connections and allies as you figure out "what are going to do?"
With Fringeworthy, at least how I run it, your background is as important, if not more so, than your new friends you make on alternate Earths. Todd can verify that I made use of the PC's backgrounds when they were back on Earth Prime. (At least those who had one.
) They made lots of connections and friends on many worlds that they could go back to and deal with their latest issues and problems. In many ways, I ran it more as a political and connections based game, than a shoot'em up, though we did have lots of that as well. Also, I use Savage Worlds for Fringeworthy, so investigations are again, different from Fate or Gumshoe.