Yes, cell itself has a decentralized architecture but that doesn't mean you need to do everything in a decentralized manner.

Just like you can build spaceships, police station, cars, and all kinds of complex things using lego blocks, you can build complex architecture using the simple building block that is cell.

I myself have been experimenting with different approaches of structuring apps using cell, and there are really a lot of different ways since we become free from having to inherit classes and instantiate objects from them. I don't want to be constraining about how one uses cell so I don't talk much about what a "best practice" is (yet)

But maybe sooner or later people can share some nice approaches for structuring "traditional apps" using cell