Bring back pacific siege region because:
1. It is nowhere close to the indian siege region, so why combine it? Turning Bab into Indian Ocean made sense atleast.
2. It is unreasonable to take away a siege region without previous notice to Japan who has many ports designed around pacific sieges. Those ports have become useless now. This is simply punishing a nation because they are strong enough to defend their naval region. (Which has been attacked MANY times)
3. It messed up the entirety of East-Asia. There are recent developments in Ashikage Shogunate where harbors are being developed which I think can lead to interesting naval siege battles. There is no way they can afford participating in naval sieges at this distance.
4. Everything east of Indonesia and West of South America has essentially been turned into an economic & strategic dead zone with no incentive for naval activity.