I studied maths as a remote degree (after having completed another degree earlier at a regular university), so I didn't have lectures. There were (optional) tutoring sessions (that I didn't make use of) and a few optional in-person sessions with the teacher where they would summarise the material, but otherwise we were just expected to read the lecture notes (that were self-contained like a textbook) and do the exercises. To me that worked very well and from attending the in-person sessions, usually meeting the other students was more valuable than the actual content itself.

So I guess I don't fully understand the value of lectures, at least not in maths. If I read up on the material, I can go at my own pace.

Of course, everyone learns differently, so YMMV.