为什么没有更多的Java代码使用PipedInputStream / PipedOutputStream？

I've discovered this idiom recently, and I am wondering if there is something I am missing. I've never seen it used. Nearly all Java code I've worked with in the wild favors slurping data into a string or buffer, rather than something like this example (using HttpClient and XML APIs for example):I've discovered this idiom recently, and I am w