Why did the ottoman Safavid Mughal didn't become one empire?

The Ottoman, Safavid, and Mughal empires did not unify into a single empire due to a combination of geographical, cultural, and political differences. Each empire had distinct religious identities, with the Ottomans primarily Sunni, the Safavids Shia, and the Mughals a blend of both, leading to sectarian tensions. Additionally, their territories were separated by significant geographical barriers and rival interests, making sustained cooperation and integration challenging. Ultimately, their competing ambitions and conflicts further entrenched their separateness.