I believe it's a bit of this and a bit of that. My understanding is that source routing wasn't widely adopted because it couldn't quickly adapt to changes and

I believe it's a bit of this and a bit of that. My understanding is that source routing wasn't widely adopted because it couldn't quickly adapt to changes and partitions. Now that we can calculate routes trivially on consumer grade hardware, perhaps that's a forcing function? Come to think of it, I see this as a conceptual extension and optimization on BGP Policy Based routing. Seems like it's removing the overhead and formally separating the control protocols from the data protocols.