Speaking you mother tongue is undoubtedly much easier than speaking any foreign language. But is speaking 5 foreign languages harder than speaking just one of them?
Pure Java is just not good to code a user interface – those who used Swing know perfectly than things get messy at some stage. And no matter how good your imagination is, modelling a view with an xhtml tool is a much more intuitive task than any imperative based solution.
‘I love you’ in Klingon just doesn’t sound good.