The slow part of making a video was never the recording. It is what comes after: scrubbing back through an hour of footage to find the take where you finally got the line right, then trimming the gaps between every sentence.
Studio already knows what you meant to say, because you wrote it in TubeSpanner. That one fact changes the job. It can tell a fluffed line from the real one, a tangent from the point you planned to make, and a thinking pause from a finished sentence. The first pass arrives cut, and you spend your time judging it instead of assembling it.