So since we're adding submarines...

[Elamys]

If that's the exception, what's the rule? What exactly is the "fc stuff" that requires 4 people?

There is no other FC thing that requires 4 people. IDK what he's going on about.

In terms of things that are exclusive to FCs, it only requires one person. You only need one person to buy and set up buffs. You only need one person to set up a house and its permissions. You only need one person to manage all the other aspects of an FC. But ultimately, there isn't much FC only content, and this ridiculous bandaged on requirement of "have 3 other people come to the workshop while one person presses the button" doesn't fix any of that.