1. KDE is not commercial AFAIK. 2. Windows was (is?) not coded in modern C++ but a bastard C or very old C++ from what I understand. Bugs were also mainly by

1. KDE is not commercial AFAIK. 2. Windows was (is?) not coded in modern C++ but a bastard C or very old C++ from what I understand. Bugs were also mainly by third-party drivers and software. The industry for home user software had very bad quality, that’s is true, but that had nothing to do with C++. C, Fortran, Delphi and others were used too. 3. Videogames are in an industry where deadlines are more important than bugs and companies really don’t care about fixing stuff before release.