I guess each individual has a different thought process about this. I did a whole semester not going to 1 out of 2 lectures for a subject - and I did above-average in it (but it had recordings).
I agree with your point - I personally find lectures quite pointless. Majority of the content I learn (being an IT student) is done in the computer lab classes or practicals, where you put the theory to practice. It's very rare that you understand the content completely and thoroughly right after the lecture, and it can take alot of consolidation after it to get used to the content and to understand it.
Majority of the time I find myself on my phone or tablet during lectures too. Don't get me wrong, if the topics are interesting, perhaps i'll listen to the presentation.
Now in direct response to your question: Would I be missing something by not going to my lectures?.
Short answer: Yes
Long answer: The interaction that is contained in the lectures is something that you can't get off lecture notes or a recording. There may be examples, practice etc. that are only in the lecture. Students may also ask questions that a recording may not pick up, and it may be a question you have as well (now, provided that you have said there is no recordings, you won't get access to any of this).
All in all - If you think you're confident with the topics and can score well just by going off a PowerPoint, then I say it's doable. However this is in no way encouraging you not to attend..
If you think you are being more productive by staying home/going to the library and studying, perhaps you should try it for a few weeks and see how well you feel after it? If you can't do tutorial/prac questions, you could consider this a benchmark and try going to the lecture and observing whether there's a change.