I'ts like Philip says, it's just a tool for projects to keep informed about all changes, proposed merges etc. by the feed of the Project Profile. (all Profiles that have the Profile as co - or only manager we keep track of this way, or an eye on if you like ;) )
Of course it's possible to create a, for example, Dutch Roots Project PPP category and or a Dutch Roots Project non PPP category, but such a category is just, let's say, the same as the list we now use , and we would than also have the non PPP't ones listed.
But we now have most of them, the non PPP'd ones listed here : Category: Project Collateral-Prospect and many of the unsourced Dutch ones you can find here : Category Netherlands Unsourced Profiles as well, so to create again another category is not something we really need for the Projects I guess .
And indeed this is a whole new thing for us as well (the Project Profile) and our tree really is a beautiful work in progress . If this question was about a way to receive the feed as well, I'll ask how we can invite our members for the Project googlegroups of the Project Profiles , didn't figure that out yet, but if members are invited and except the invitation, the googlegroup can but, doesn't have to be used to communicate, but at least all members will receive the feed of the Project Profile as well . This way the whole project and all members can keep track of all profiles added to the Project Profile...