I think it would be good if there was a kind of explanation on why/when users should create custom tasks. I mean, half of the userguide is devoted to creation of tasks, so there is a question when users should declare new tasks in build.gradle and when should they create own classes (Custom tasks). Both the benefits (ability to test the tasks ? less cluttered build.gradle ?) and the downsides of using custom tasks (scattering build logic - not everything in build.gradle ?) should be mentioned.