Where's the added value of Qt's support for multithreading when compared with the C++ standard support for multithreading? IIRC, Qt introduces the irrelevant QReadWriteLock and that's it. In fact, the only upside of Qt's multithreaded support is that they were developed to serve Qt's very particular needs.

Qt is awesome but one of its main problems is its insistence of duplicating standard components and coming up with subpar alternatives which are then forced upon developers.