So, why does the "light party to advance to the next stage of FC crafting" exist?

[Teryaani]

Hmm, I think it is the people upset by this that are missing the point. How much you wanna bet SE has plans for more content in the future that requires a group and this was just to prepare players for what is to come?

If they do actual group content that isn't just having to have a party of people in a DoH class while one person does something, I would get that. This particular requirement was pointless. So hopefully if they do this in the future, they think it through more.