That’s interesting because I can’t imagine learning a subject without a textbook. I have a hard time believing another medium would have the depth and density to get all the points across. Although it does depend on the subject matter and one’s learning goals.

But I also do read textbooks for fun… Now that I have a few decades of experience in a lot of these subjects I get way more out of the books. And I can start to understand more of the meta information. Like, of all the things the author could’ve used as an example, why did they pick that. Also, it’s hugely interesting for me to look at the homework problems and theorize why this particular problem was picked. Especially fun for electrical engineering books. But ya, I’m weird like that.