That would seem odd.. the QSS is completely orthogonal to the code generated by the UI tool.

I accept that sometimes you need to some tricks with it and sometimes the layout in the preview is not the same you get at runtime which is annoying.

But in my UIs I use hundreds of widgets and I can't even begin to think about the useless effort required to write all the code by hand vs. spending seconds to drag and drop widgets into their place visually in the GUI editor...