When I was programming with Java-EE I was surprised how much effort had to be put in to produce the production artifacts: .Wars and .Ears and so on. I had to us

When I was programming with Java-EE I was surprised how much effort had to be put in to produce the production artifacts: .Wars and .Ears and so on. I had to use a language called Ant. I also had to write Java, JavaScript, CSS and HTML. On the C-side it is "make" or something similar. It means you must master multiple languages, some of which may be statically typed while others are not. I assume integrating C with Python is similarly lots of overhead which in principle you shouldn't have to do. Why can't I just write everything in a single language and be done with it? Why do I have to write a program that transforms my source-code modules into an executable?