Backward Compatibility

The internet is littered with articles on backward compatibility and why it is important and rants of people who work/use 1970s systems on the same. Well the last sentence there was a pun but people do rant on not being able to use the PS2 games on PS4 and or not being able to use Lint with the new c++11 or c++14 features or sticking to an outdated kernel (2.6.36) and not being able to use the new virtual environment enhancements, etc. Finally, all of these rants boil down to, “Everything should be backward compatible and should not break existing systems”.