Notice how in his Qt example he lost control of the window style, icon, brush, cursor, styling of the message box, and a dozen of other little things that you can do with low level win32 api.
http://www.paulgraham.com/disagree.html
QT has techniques for accomplishing all those little details like icons. But it also has the defaults already built in. So it is not necessary to set them up for a simple Hello World application. Later if he wants to change them he can add the extra code.
I intentionally picked these examples to show how good programmers are at making nice abstractions to reduce the amount of work we have to do.