Comment by ExoticPearTree

When discussing programming languages, you need to take into consideration how easy it is to find developers with experience on a certain language.

Sure, you can do web apps in Perl with Catalyst or other frameworks, but the PHP developers are easier to find.

And then, after you develop entire GUIs in a language, it is a herculean effort to port that to another.

And lastly, JavaScript has its own issues too.