You'll have intelligent devices of various sorts that are easily reachable from the network but aren't part of the actual fabric of the network. Electronics are not good for communications. What makes photons so great for communication is they don't interfere with each other. They collide and pass on unaffected. You can send them two-way, and they are not subject to electromagnetic disruption.
Many signals can flow through one fiber.
But the fact that photons don't affect each other means they are cumbersome for computing, since you want interactions in computing. You need to have the charges affect one another - that's the heart of computing. The heart of the transistor function is that you can control a bigger force with a smaller force. But photons don't control each other. Yeah, there is.