JS classes build on prototypal inheritance, they aren't an alternative mechanism. So you apparently either don't understand them, don't understand "classic OOP", or both.
The point was that the syntactic sugar isn't needed.
The 'class' sugar actually obscures the power of prototypal inheritance, and imho, discourages people from learning it - to their, and the language's, detriment.
Yes it is. The success of CoffeeSCript is absolutely a validation that developers are more productive with syntactic sugar such as the class keyword, destructuring and many many other features.
Now nobody forces you to use them. So why complain? It doesn't make Javascript harder to read for you, quite the contrary.
So it is your opinion that the community and users shouldn't give feedback on the design and direction of the language they use every day? That's an interesting approach to openness.