I think mid-long term Byz got buffed, although largely indirectly. Vassal feeding seems like it would be stronger now, as you can holy war without directly bordering a country if your vassal does and vassals will now make their own claims so you can sell them those lands. The new autonomy reduction to their government forms means that they should have an easy time remaining stable. The nerfs were all to their early game, which does suck a lot. Especially losing those islands, and the Ottos getting much stronger, is going to be a very big problem. The Constantintople trade node seems richer though.
EDIT: It will be VERY interesting to see how the new rebels interact with the AI. Now they'll face full blown rebellions instead of simple single stacks, so hopefully that can be used against the Ottos a bit.
EDIT: It will be VERY interesting to see how the new rebels interact with the AI. Now they'll face full blown rebellions instead of simple single stacks, so hopefully that can be used against the Ottos a bit.