Downshifting in a seamless transmission wasn't always a part where you needed to be that fast. It still is, but kinetic energy recovery may have made it more important. Since upshifting is the primary goal in a seamless transmission, I think the downshifting part seems like a more challenging engineering feat.
And the fact that the transmission side is still problematic means that energy recovery is still not optimal. I wonder what is the difference between the energy obtained when it is working as it should and the energy obtained in its current state?

