If you start a new language, why not use OOP and eliminate language crutches such as: sizeof expr and keysof expr? An OOP approach is easier to both implement a

If you start a new language, why not use OOP and eliminate language crutches such as: sizeof expr and keysof expr? An OOP approach is easier to both implement and grasp - expr.size and expr.keys. And lastly, the main difference with JavaScript I see is the lack of the "function" keyword - is this a good enough reason to advertise this as a new language?