You may be right about LI, but in vanilla tribals are kick in the balls for everyone that want to play them, basically forcing them to be the underdog like natives in EU. And however fun that may be, it instantly ends when some big blob wants to conquer you (true that it happens much less often that in EU but still). In LI that would not be so harsh, because LI have no starting blobs, but that mechanic would still need serious rework. And that is probably much work and hassle, it is one of the things that must be done completely or not at all.
First thing that need to be removed is that stupid requirement of not being unreformed pagan to convert to feudal/republic. While that have some sense in vanilla, it is meaningless in LI. Another one is single holding mechanic. but all that have been already discussed in various places in the main forum.
Oh, and reminding Irish and Scottish clan politics in 1500 is kinda silly in LI. We still have druids around! Who said that they can't be feudal druids