It's the classic linking problem - if you write a plugin in $LANGUAGE, the end-user has to have a Vim compiled with $LANGUAGE support. My favorite example is C

It's the classic linking problem - if you write a plugin in $LANGUAGE, the end-user has to have a Vim compiled with $LANGUAGE support. My favorite example is Command-T. In order to link VimL to C, he had to write a Ruby extension and use the Ruby interface. Which is a total pain.