I've heard of (but haven't actually seen) WWs where some people can get more than one role at once. Having a mason that is also a Seer is the most effective thing I can think of right now. You'd have a number of people to tell who you scry/what they are. Or a mason Baner.
Masons are less effective/not nice in games with recruitment, because when you become a wolf, you rat out the other masons.
So they can become more or less effective in different variants. They also become more or less effective depending on who's a mason, but whatever.
edit: The Matrix Rewound has been submitted for approval.