ForceStealer
Double Growth
Yuffie and the Wutai segment is an ideal piece of optional content. It adds to the flavor of the world, and some context to the plot, but none of the plot changes without it. Also, you can still go to Wutai without Yuffie and get some of that context, you just won't have the materia theft quest. I agree with Ite that being afraid to make something optional because a player might not see it is pompous and silly.
The plot Vincent brings with him is different, imo. Yes, the story makes sense without him, but it is fundamentally changed by it's presence - Sephiroth was born of a human woman, the role Hojo actually plays in the history of the crisis. That's a much more glaring absence.
The plot Vincent brings with him is different, imo. Yes, the story makes sense without him, but it is fundamentally changed by it's presence - Sephiroth was born of a human woman, the role Hojo actually plays in the history of the crisis. That's a much more glaring absence.