I don't want to have to download multiple, redundant scripting systems, especially if they are only available as, or require, a full development environment devoted to them.
Reminds me of the early PHP days, having to have gcc installed, having to get the sources for PHP, Apache and MySQL and build them all from source in order to create dynamic web pages using those technologies. Now it all comes packaged together and just works.
I work in a Java shop. Before coming here everything I did was either in Delphi for Win32 development or Perl for Linux or PHP for the web. There are some barriers to entry with Java, having to run Tomcat or some other container in order to run JSPs, etc.
Installing the JDK is far simpler than the early days of having to install PHP, Apache and MySQL from source used to be, but Tomcat can still be a pain especially if you need to run it with Apache.
-- Dave Hull http://insipid.com