I think people who can compose complete well ordered arguments in their head are like those who can play chess well while blindfolded. It's an extraordinary talent.
- Think of a point I'd want to make, perhaps in 20-60 seconds.
- Do a few video takes until I believe it's good enough. Sometimes the first take works.
- Keep doing it until I have enough material, then edit the video.
As someone who is in his 50s though, I can understand the point of view of someone who grew up in an age in which writing was the obvious way. Paul might think differently if he tried to start a Youtube channel, but it doesn't seem to be interesting to him.
For example, when editing video, there is a lot of friction due to the software you are using. Writing can have a lot less friction. You can literally just take a pen and paper avoiding a computer altogether.
That being said, one point Paul makes, is that finding a conversation partner that is willing to patiently listen to you as you explain ideas may be challenging. Filming a video and putting it out there can make it less challenging. And you can get some constructive feedback from many individuals. Although, I am not sure to what extent Youtube is the right medium for this exercise.