I'm not sure what the other user was thinking about, but I think that GNOME's push towards client-side window decoration is annoying and imposing. Depending on your WM, some applications become "useless", they waste space on small screens and just reinforce a sense of fragmentation. I get that it looks better on GNOME, and I appriciate it when using GNOME, but as there seems to be no system to remove the CSD on traditional systems, I still think it is an overall bad move.