Another great set of explanations. Love to have on the show (3D in Review) for an interview. You can reach out to me at firstname.lastname@example.org and I will send you a message as well.
It might be fun to talk about quaternions and maybe the coordinate systems used in Unity and Unreal; the two more popular real-time computer visualization systems.
I really like the mention of sentiment analysis and emotion detection. These are going to take on added complexity in VUI, compared to written text, given the variations of speech and tone which should feed into the analysis along with text. Will be exciting to see how these areas evolve!