We made a lot of efforts at defining which religions correspond (beyond the spiritual aspect) to Tribal politics. We decided it would be
unreformed "
Barbarian", "
Celtic", "
Norse", "
Shamanic" and "
Steppe" civilizations. Upon reform, these systems enter into a new political system and leave aside the Tribal politics.
This is now well defined and documented. So I'd say let's keep consistent with our established definition.
@ Cèsar: it means that not all realms, but a large share of them, are tribal. There are two things to be considered here. First, LI maintains elements which "should" have logically disappeared from some areas, and Tribal politics is part of it as much the fact that Celtic paganism is "well and alive", by Shaytana's words. Secondly, and I think this is related, we need to keep away from a "developmentalist" approach caused by our 21st century perspective on things: I mean that for the context of LI, tribal politics should be considered as inherently different, but not necessarily inferior, form of socio-political organization than more institutionalized states. The whole ambition of the Tribal politics system is to make Tribal power less stable, but potentially much more powerful in the hands of a skilled and charismatic (high authority) man or woman. I would like to refer to SELIN's manual linked to in my signature on these features
Which brings me to what Darkreborn said - balancing the whole thing will be key. When TOG arrived, we integrated its features in a way that the option to reform, although a nice gameplay objective, would be even less a necessarily "good" strategy than in Vanilla. So we should have the same philosophy in mind I think.
One way to consider this is to remember the potential for importing Enlil's "migratory CB" which we could link to the Tribal Holdings, thus maybe balancing the weaknesses introduced by that kind of holdings with this interesting opportunity for fluid expansion.
To sum up, I think that we should apply the mechanics to the list we defined for Tribal politics, while using the opportunity to consider re-balancing of existing SELIN mechanics as well as Enlil's migratory CB.