The mechanical motion involved, physically putting your thoughts down. It isn’t the same as typing at all where you just click a button, having to motion the letters and words is surely worth something in itself.
You don't click a button, you touch it with your fingers in a mechanical motion physicality putting your thoughts down, the letters and words, there is no learning-related conceptual "surely", just the fact that it's less efficient to do and redo, which in the poorly designed lecture situations can force you to stop and think instead of doing dumb transcribing