QFile does not emit bytesWritten() and readyRead() signals

Documentation:

Unlike other QIODevice implementations, such as QTcpSocket, QFile does not emit the aboutToClose(), bytesWritten(), or readyRead() signals.

Why not to add this functionality? Windows has asynchronous files, UNIX always has this functionality..... why not ?

I want to receive readyRead() on QFile::open(stdin, QIODevice:readOnly).... but it does not work. I must use ugly QSocketNotifier.