Constantinople should have %75 autonomy, Morea should be a vassal and Anotolian(also Chinese) should start with tech level 4, if we are all in for realism.
Also, Byzantium should have Catholic as the state religion.
And to contradict with myself;
Adding +%10 galley combat ability or +%15 or so fort defense to Byzzie traditions wouldn't break the whole game and destroy the Ottoman advance by covering whole Europe by double eagle heads of love or anything, they will still die by 1450-1460. Western tech and eastern unit Byzantium would only be accurate, again not game breaking since the whatever tech he can get in 10 years won't save them.
About the Theodosian walls, making Constantinople some mega level fort won't do any good to Byzantium. They just won't be able to afford it (well this sounds kinda realistic aswell, huge wall but broke Emperor). Rather some %20 fort defense would be OK, if it's promised that Ottoturks will have Orban as some siege master advisor or free cannon maker, so nobody but the Turks can conquer it in 1400s (bye bye Maltese/Genoese Constantinople)
Although not a big topic, this can be "fixed" (if we can come to an agreement that it's broken) in some half an hour at most, so threads alike about Byzantium might end and we can move on to the super ignored tech monsters of Granada and China, which might need a better fleshout than some 30 mins.
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