I can't wrap my head around how anyone functions in a professional, uses-a-computer-all-day capacity if they can only type 60wpm. Dropping down to 20wpm, even temporarily? How do you get anything done that way?
Probably the same way you are generally productive but currently spending time on HN? Very unlikely anyone's productivity is "capped" by their typing speed. 99% of my productive time is thinking about solutions, not the physical act of typing them out.
I can transcribe audio from meetings in almost real time. It doesn't actually require blazing fast WPM to do that. I get plenty done. And no, the first working squeezebox prototype is not my daily driver. Second version I hope but it's more about the process and I wouldn't be surprised if it is just the next entry in a fairly long line of keebs to challenge my original ergodox full-hand and walk away leaving the ergodox as king of the hill.
I type at a pretty decent pace (~80 wpm), but I spend a lot more time thinking about what I'm going to type and reviewing what I just typed than pressing buttons on the keyboard.
I'd imagine this is the case for most people not doing stenography or data entry.