Why prefer scripting instead Qt/C++ on webdevelopment?

[Alir3z4]

The answer is quite simple - most things people do with their webpages can be expressed in fewer lines of code in scripting languages than in C++. PHP is a high level language whereas C++ is more mid level (strong typing, predeclared variables, etc.).

Yeah, for instance python is sweet as well in expressing code and ... .
But is writing less code can be best reason? if you mean less code i prefer using ruby for it but you know ruby gonna be worse after a while on performance.