Ask HN: Why are new Programming Languages being developed even now?

Isn't it easier to build a package or library for one of the existing languages instead? 1. There are so many powerful & mature languages like Python, Java, PHP with vast communities. They can help spread the word. 2. There is quite a bit of rework involved in developing a new language - such as creating new syntax for loops, conditions, variable types, handling memory allocation, etc which are already present in existing languages