I disagree on this one. Before `class`, people built ad-hoc class-like constructs based on prototype inheritance. Often in slightly different ways, with differ

I disagree on this one. Before `class`, people built ad-hoc class-like constructs based on prototype inheritance. Often in slightly different ways, with different constructor choices and different implementation details. For larger code bases in team environments class is a really critical standardization, otherwise you can easily end up with a mess. It's also important for tooling, because IDEs can much better understand what's going on and present information better. Now, if Javascript really needs things like private class members and a lot of the other difficulties around classes is another question.