Comment by Twey

Abstracting something away and duplicating it for yourself are two very different things! Remember Java Swing?

But I take your point, if you want to target the lowest common denominator of window managers it makes some sense to do your own window management. Mind you you could just ship both a browser and a window manager…

I wonder to what extent the pattern of applications doing their own window management masks (and therefore perpetuates) the problem of inadequate window managers.