Seriously?
First if we are going to go one personal biases do you understand how many people have a personal bias towards the Purple menace? I mean PDox made a DLC about this one country and people still buy it. You really don't want to start off your argument with personal bias claims.
Second - so what if it lasts too long? Not holding Constantinople deprives the Ottos of some tax, trade, and manpower ... but they are still the biggest, baddest boys around for a hundred years. So what if some pathetic island state revolts and installs a Pelologoi pretender does that actually change game balance? Some imperial pretender arises up in Rhodes, how exactly does that make the Ottos weaker? The Ottos can already crush any such pittance of a state and it won't materially change their rate of conquest.
Further in the vast majority of my games they don't even make it 1453. It is a random die roll - how fast does Albania fall, how fast do the Ottomans burn through their cores, Byz never survives the Ottoman assault unaided. Of course freakishly many other states don't die and they actually affect game balance: Timurids can hold out often and stop Persia (a main Ottoman counterbalance) from forming. Delhi and QQ both can routinely survive and prevent their historical successors (who you know are better suited for their historical roles) from emerging. Let us not forgot about Timbuktu, the Inca, the Aztecs, and Vijay who all often last inordinately long term who through off the major wealth distributions in game. Lest we get too caught up in states persisting too long we need to remember that other small, pivotal states, like Brittany, The Livonian Order, Lorraine, and Navarra all mysteriously die a century before they should. Skanderbeg dying out in the first few years is a bigger affront than most of the Byz in the islands stuff ever could be. I mean I really don't see how this is worse than Gotland - a slightly ahistorical map that changes game balance not a whit.
We can worry about putting a stake through a Byzantine zombie's heart after we get a decent evolution of Persia, India, and Mesoamerica.
Frankly, this just reeks once again of Pdox being unable to balance rebels and nerfing the fun out of something to try to cover it up.