Still really struggle to understand people's obsession with the Ottomans reaching their historical borders.
France never reach the borders of modern France because:
1) They're scared of attacking the HRE.
2) The Burgundian Inheritance seldom goes their way.
3) They ally Provence.
4) They can have good relations with Brittany.
5) Sometimes England will pull as Castile alliance.
And this is all deemed proper and fair.
Meanwhile the Ottomans with infinite manpower, mana points and unrest reduction don't conquer some low development provinces in North Africa and people complain.
Let's just take it that within EU4's capabilities it's impossible for countries to expand in a truly accurate way, like
@Manwe_Sulimo pointed out. Britain can't do naval landings in India, and I don't think any of us trust the AI to purchase a trade company and use Mercs to conquer Bengal whilst managing an economy.
Therefore we just have to look at the overall power that the country has, not whether they've conquered some 3 dev Ibadi province in North Africa.
Are the Ottomans power over the course of the game proportional and creating some form of game balance? I think not. In the majority of games the Ottomans are an unrivalled beast no coalition or alliance network can defend against until the player comes along. Some people like this for memes but I don't.
I think if this conversation (about game balance in general, not specific to the Ottomans) is ever going to be productive we have to stop looking at nations borders and look at their overall power as an AI. Mana generation, manpower, pips, income, diplomacy and other inbuilt factors such as national ideas and disaster are what you look at.
From a player perspective, the Ottomans as an end-game tag with no Admin Efficiency or Diplomatic Annexation cost are OK but nothing special. The Mamluks are better just for their ability to tag switch.
From an AI perspective, the Ottomans are an absolute beast and if they take Quantity ideas they're unplayable for the AI.
I would seriously stop complaining about this and concede everything else if Paradox did just two things.
1) Stop the Crimea event. For all this talk of historical borders, the Ottomans are far too keen to expand into Ruthenia ruining the formation of the PLC and sometimes even Russia. Two countries that should pose an eventual threat to them.
2) Ban the Ottomans taking Quantity ideas. You could say the same for Russia, the difference is Muscovy/Russia will never be rich enough to field 250k men in 1520. The Ottomans are.