[Semiapies]

"I've worked on plenty of Java projects where there were sections of the code that some of the programmers either didn't understand or didn't want to touch with a bargepole because they were 'too scary'."

And this is undesirable, is it not? Encapsulation aside, sometimes people get shuffled around in projects.

It's one thing to say, "OK, junior developers, don't mess with the tricky stuff in this project." It's another to say, "OK, I've decided to start writing this part of the project in a language the rest of you don't actually know."