We don't need more FC activities, by their definition, FC activities are just regular activities with gating. What we need is more FC tools. In-game calenders, event management, better recruitment tools and ways to interact with members. I like the idea of achievements and challenge lots because it supports the idea of FC members doing existing content together, which is the area that needs improvement over linkshells.

This stuff already exists in the companion app, it just needs to be in the FC window