I've expressed exactly this point to many people involved in C#. Partly, they do not appreciate that most PL features can be implemented as libraries in more powerful languages. Another part is they understand that blub programmers are interested in features, not libraries. Being popular means appealing to the masses.

If a language does not have closures nor more complex control flow features, you really can't implement PL features as equivalently easy-to-use libraries. IMHO, that's why most mainstream languages continue to add superficial features rather than fix the core problems in their PL.