I’d equate it to baking a loaf of bread from a recipe.

If I had the recipe read to me while I was make it I could focus 100% of my attention on making the bread.

If I had to watch a video I would have to watch, pause, then complete the step. If I was reading the recipe I would have to read a step and then do it. My attention would become broken in ways.

If I knew how to make the loaf I could listen to an audiobook while making it. There’s no way I could read a book while making it.