I got the Apache @netbeans 13 Flatpak to build and run a C++ program by following instructions to enable the 8.2 Update Center and install the C/C++ module. I also managed to switch to dark mode (Tools->Options->Appearance->Look and Feel). https://netbeans.apache.org/download/nb120/#_cc
I recently removed a couple of blog entries about my disappointment in CentOS Stream 8, but the About page on my CentOS Stream updates blog tells it pretty well.
tl;dr hoping for better things in Stream 9.