But that's because John Carmack et al. were geniuses that were ahead of their time, who put effort into making fun out of programming games. It became especial

But that's because John Carmack et al. were geniuses that were ahead of their time, who put effort into making fun out of programming games. It became especially important as people started buying Quake's engine and modding it to be different games entirely. https://en.wikipedia.org/wiki/Game_engine#/media/File:Quake_-_family_tree_2_Simplified.svg https://en.wikipedia.org/wiki/Game_engine#/media/File:Quake_... for example