I also do screencasts speedrunning through the product. It's amazing how many quirks and UX smells that became invisible this uncovers. In other words, a crappy UX you deal with daily to the point it becomes invisible magically becomes blatant when you record a video. Cognitive dissonance and all. You find yourself saying "And you can simply do X", but find yourself clicking on 23 buttons to do X, or an error message you instinctively used to dismiss pops out, and it makes you unconfortable.

My videos are full of swear words and surface these issues.