If you don't udnerstand something in a lecture, but you're not there in person and only watching a recording, who you gonna ask for help?
And sometimes, not all content gets recorded so you may be missing out on some useful information.
You are also going to be at least a day behind on subject content, if not more if it takes a while for your lectures to be uploaded, so you are effectively losing even more time that way.
Personally I completely zone out when listening to stuff on repeat, so a 1 hour lecture may take me like 3 hours to listen to, so I prefer getting it done there and then in the lecture, and not having to think about making notes.