It’s absolutely fine to contribute “just” to the discussions. In fact, if you can read c/c++ and point out issues you notice, “eyes on code” is probably one of our most needed resources. We merge a TON of code, and the more review it gets the better. Even “it’s not clear what this chunk of code does, please explain in a comment” can be valuable, because someone working intently with the code sometimes has trouble noticing when it requires loading half the program into brain-cache to understand it. (yea, I do this a lot, then I can’t even figure out what I did a month later)
