Regarding your second point, posts about C++ or Java seem to be lacking simply because the languages evolve over a multi year phase. I do remember seeing posts about C++17 on HN and there being discussion about it. People will occasionally post libraries they made in that language. I don't do a lot of Java development, but I am interested in C++ and if you are too I would check out r/cpp if you haven't. Many of the posters are people doing a lot of work on C++ - compiler developers, people working on the standard, etc.