I didn't watch the entire thing but I saw a lot of it, and the guy makes a lot of good points. I am definitely beginning to realize that electronic devices can seem to be equivalent to older, more low-tech devices, but they don't work the same way in ways that we are only beginning to understand. For example, it has been proven that people retain less from a book when they read it on a tablet or computer screen than when they read it in paper form. They had people read a book in each format, and then they were asked questions on the contents, and the people who read the book on an electronic device retained 30% less. Psychologists don't seem to know the reason for this, but I've seen a few of their theories. One is that on a computer screen the text moves around on the screen as you scroll down. But a large component of memory is physical, i.e., the physical location of what you are remembering. For example, when you read a book, and you later think of a passage in the book, you usually see its location on the page in the book. For example, you'll remember that those words were at the bottom of the right-hand page. That's how your brain encodes the information. But if your brain saw those words in several places as you were scrolling up and down on a webpage, your brain doesn't have that physical location to encode the memory with.
After reading that, I always try to read any important books in paper form. I've also gone back to taking notes in a meeting or conversation with a pencil and a piece of paper. I think you remember things better that way as well, as the guy in this video says. Writing on a page takes a lot more thought and mental energy, and has a lot more sensitive feedback then touching a screen or typing on a keyboard. You have to form the letters, and you feel the contact of the pencil tip on the paper, and you have to pay attention to the point of the pencil and rotate it periodically as it wears down while you write. I think all those things make you pay a lot more attention to what you are writing, and remember it much better as a result.