Again for good measure:

And what’s particularly unique is that the electrical and optical interconnectivities don’t interact with each other. So they can crisscross. There is a significant utilization of space, and our form factor benefits as a consequence of that. So that is what we call the optical interposer. Now how does it vary from

So just to be clear when we talk about simplicity of design. Designers today have a major problem mapping the layout to accommodate optical pathways. And the problem continues to grow consuming more time and effort as electrical nodes shrink. 

In other words the speed at which new applications can be rolled out can be accelerated. This is a biggy and something that can be promoted because it is a real problem for the silicon photonics industry and rushing it can have disastrous effects. POETs hybrid system removes/reduces the level of concern. Again some companies are implementing at the alpha stage. It is really quite remarkable in my opinion.