It doesnt have to. But it solves the FC ward issue.
Now for FCs the FC wards were used to guarantee a house. Which is required for that workshop. But if the workshop is removed from those houses and put at the FC itself. A house isnt required. Which means that FC houses can become part of the individual house market, with equaly bad odds of obtaining a house. To balance it out further, they could even decide that FC bidding can only be done by the leader (or limit that bidding in some other way to avoid an FC spamming bids on for example a large/medium house - which are already have enough competition as it is).
Thats what it can help. And sure, if they have a house, they can make the workshop accessible from both.
