idioms: intro improvements (#304)

idioms/index.md

@@ -1,14 +1,14 @@
 # Idioms
 
 [Idioms](https://en.wikipedia.org/wiki/Programming_idiom) are commonly used
-styles and patterns largely agreed upon by a community. They are guidelines.
-Writing idiomatic code allows other developers to understand what is happening
-because they are familiar with the form that it has.
+styles, guidelines and patterns largely agreed upon by a community.
+Writing idiomatic code allows other developers to understand better what is
+happening.
 
-The computer understands the machine code that is generated by the compiler.
-The language is therefore mostly beneficial to the developer.
-So, since we have this abstraction layer, why not put it to good use and make
-it simple?
+After all, the computer only cares about the machine code that is generated
+by the compiler.
+Instead, the source code is mainly beneficial to the developer.
+So, since we have this abstraction layer, why not make it more readable?
 
 Remember the [KISS principle](https://en.wikipedia.org/wiki/KISS_principle):
 "Keep It Simple, Stupid". It claims that "most systems work best if they are