Yes, I have noticed that youtube has some transcripts. The problem is that when people talk, they don't realize how illogical are, and how they skip from one thing to another.

For a tutorial to be easy to read, it needs to be in point form, and it needs to cover all eventualities, and to be very clear where everything is. This is seldom done in a visual tutorial. It is simply too fast, and my experience with people who are technical is that they use jargon, but they never explain what the jargon means.