Hi @The-Janus
You raise some interesting questions. One thing to remember about the Unit roster, is that Europe came out after Pacific and they were meant to be played together.
Obviously Europe as a stand alone plays differently and you can House Rule any units you’d like. The Captains House Rules address some roster changes considering price and function.
Although for the Global game, you may find it interesting.
https://drive.google.com/file/d/1jI_1JdIC-1KiTihBICJAbtX3GpVYnNgf/view