For me, and I think many others, lectures are a very passive way of learning. A well-written textbook trumps a lecture every single time. That is of course if the lecture is just a rendition of the textbook, and most of the time it is.
Care to explain why a lecture is passive as compared to a well-written textbook?
There is one
major difference between a lecture and a textbook, which is that the person writing the book is much more tied to formality. The person giving the lecture is someone you can actually watch think.
This doesn't really matter with really basic ideas, where the lecture is just summarizing things and working a few examples. But realistically, when you're listening to a lecture on an advanced topic from a person who could have written or
did write the book you're reading, you'll often find watching them think and present the stuff, and seeing what they choose to focus on, will serve you better.
On an advanced topic, the ideal strategy tends to be to read some background from a book AND go to the lecture to absorb how the person thinks. Why? Because if you didn't read the book, you'd be sitting clueless, because that person thinks faster than you.
attending lectures all day and then going home with a very limited and shallow understanding of the material really benefit them?
You are talking of people attending lectures
instead of reading the book. What about those who read the book first, are a step ahead of the game, and go to the lecture to understand how an expert on the topic thinks?
All your claims seem to apply only to situations where the lecture is just a summary of the book dumbed down for kids who won't read the book. There ARE courses like this.
But when arguing with someone like mathwonk, who probably teaches lots of advanced math classes, I don't think you should assume that all classes being discussed are going to be like that.
Most of these students are straight out of high school and have parents that are paying hefty tuition costs. I don't think the parents of these students would be too thrilled if their children stopped attending lectures. Most students in turn obviously will probably never stop attending. It's fairly sad to me that in this day and age we rely on something to medieval as our primary mode of learning.
You hit the heart of the matter. You're talking about classes "straight out of high school."
Sometimes, advanced classes don't even have textbooks, and at times, the reason is the professor can present the material better than any book on the subject can, because he's read all of them and is improving on them in his research.
You'll find that eventually, those poor chaps you speak of who don't read the book will flunk out of the hard subjects. Reading the book is the
bare minimum to surviving the hard stuff, and realistically you have to use every resource you've got to get anywhere.