Quote Originally Posted by Sairys View Post
It's not really arbitrary though, four is the minimum number of people you need for fc stuff.
What "fc stuff" are you thinking of?
Creating an FC in the first place requires four people - three of which can leave once the FC has been created.
Come 4.2 you will need four people in the FC to buy a house - but no need for the extra people to actually do anything except be part of the FC.

And then there is the workshop, which is the only actual FC activity that needs four people present that I know of. And here three of them just needs to stand around and twiddle their thumbs.