I just watched Marco Antonio's Ottoman record breaker WC on YouTube where he used a "overseas" strategy for conquering all of Asia. Once he did that he moved his capital to India (reasonably), but then he also got rid of all provinces in Anatolia and Europe in order to use the same strategy but this time for Europe. According to the Wiki, an oversea province is the one where the capital is not on the same continent and if a province is not directly connected to the main land.
So my question is why did he sold and liberated all the land in EU and Anatolia? Wouldn't it be enough to just move the capital to any place other than Europe? Why getting rid of the territory ? In case you don't understand what happened there, he had a small vassal Aq Qunly if I remember correctly that severed the link between Anatolia and literally everything on the east from that point.