Clacks drive me up the wall. Having a table mounted mic in a podcast gets to me too. I can't concentrate if I keep hearing elbows hitting a table through a mic stand.
It's more editing work but I like to split out the screen recording, VO, and PTC. Bonus, you can get rid of jump cuts and other weird edits by cutting to the screen recording just before you messed up your line.
I was thinking it's odd because, in the one video from this article I watched, the keyboard sounds were among the quietest and least noticeable I've ever encountered.
Funny, I often get compliments on the clacking of my mechanical keyboard in screencasts and livecodings. Creates a soothing background noise.