I believe you’re 100% right. I didn’t attend many, probably most, of my lectures as they’re completely useless for me - I simply don’t learn well from listening and frantically taking notes. It was much faster and more effective to read the material and interact with it in some way, usually rewording and condensing it into a study guide. The few classes I did attend either had mandatory attendance, so I just ignored the lecture and did my own thing during that time, or the class was significantly interactive so I actually learned from it.