Incompetent said:I was thinking of technology as well as the culture. I still don't understand why you say Byzantium can't take anything in Italy; Genoa should not be master of the peninsula, and there's no reason why it couldn't accept Byzantine provinces in Italy any more or less than it can accept the existence of the Papal States or Sicily. You don't have an obligation to secure every last province of your own culture.
One thing to bear in mind is that the cooperation is not over the whole 400 years; it would usually end with the Palaiologoi turmoil in the 1630s, and I'm not proposing either side can lose the culture by fighting each other either during or after the turmoil, as by then they have enough support among Greek dissidents or Neapolitan nobles or whatever to keep hold of it. So in a sense the powers can have their cake and eat it; they can cooperate in the 16th century, but then when it all goes wrong for the Palaiologoi, BYZ and GEN can fight each other for all they're worth. If you like, you can view it as more of a Molotov-Ribbentrop pact than an Entente Cordiale.
Perhaps it shouldn't require just a DOW to remove the cultures - maybe you lose the culture if you start occupying key provinces of the other power. That way it's more likely that the aggressor is punished for getting greedy than the poor fool who gets stabbed.
OK, but still I don't see it. If I am Genoa and I don't own the Peninsula and Byzantium's empire has stretch out as far as Italy, then what's in it for me to give Byzantium Italian culture? I'm only encouraging them to take more, not to back off as part of coorperation. And at the same time, it I am Genoa and I have not captured all of Italy, then my need for going after distant Greek provinces that will be harder to take and are not as wealthy is ... hard to fathom. OK, Krete maybe, if only because it can be a tough one for Byzantium to get as well, and is a strategic island port.
Ditto on the reverse for Byzantium, with it being the lesser partner.
Again, if someone can reveal a realistic scenario where it is in BOTH countries interest. I await with bated breath some examples from real multiplayer games where it actually worked for both sides and why.