It is great that QWindow::startSystemMove() has been introduced because it has become increasingly popular to remove the Windows border and have something else that follow a particular program style. However, on Windows it is not possible to pass Qt::FrameLessTitleHint and do QWindow::startSystemMove because drag to top does not suggest maximized mode and drag to left edge doesn't support tile. That is in many cases unfortunately showstoppers to replace the remove the Titlebar with Qt::FramelessWindowHint.