> At least for me, typing frees up my brain to actually move faster. When typing, I can think about the next phrase or sentence. When talking, I find it much more difficult to "think ahead", so to speak.

I wonder if this would change as we got more familiar with interacting with a voice AI. I think a lot of the extra brain power that goes into talking versus typing is the assumed need to keep talking at a constant pace because that is what a human listener expects. If we were more comfortable with pausing while talking and not feeling like we need to always know what to say next as soon as we get to the end of a word, it might not take as much brain power to speak to a computer anymore.