Why the three empires together?

Bentley and Zegler dude combined the Ottomans, Safavids, and Mughals because they are all in the same general area, and because they share a lot of similarities and some differences. They are all of Turkish decent. It's a shift in the text because they used to have their own chapter, but we are getting closer to the end of the year so maybe they want to squish everything together to give us a break(?). I hope it stays like this because it's easier, but it should stay the same because the world is getting more connected now rather than empty spaces between empires, they are now filled with kingdoms and places.