I call that comment a bit of bullshit. XFWM from XFCE, Fluxbox/OpenBox have nearly every titlebar theme in existence, with even better borders than Windows 8 ones.
I am not exaggerating when I say they could be over 1000 themes for Fluxbox/Blackbox.
The default XFWM themes (coming from XFCE 4.10) include several ones with a even a clear grabbable border, if not all of them.
We had the Bluecurve theme from Red Hat when some HN users
didn't even start Elementary school.
And with FVWM literally you could mimick any interface ever.
Not the case wifh Fluxbox/Openbox/Blackbox. You have under Fluxbox, from modern Zukitre, Nordic... ones to the ones mimicking Mac OS from early 90's, Motif... anything. Ditto with XFWM.
On XFWM I remember one with traffic light colours and square buttons which was perfectly usable. Also the theme pack came with an almost exact copy of the Windows XP's Luna theme.
I am not exaggerating when I say they could be over 1000 themes for Fluxbox/Blackbox.
The default XFWM themes (coming from XFCE 4.10) include several ones with a even a clear grabbable border, if not all of them.
We had the Bluecurve theme from Red Hat when some HN users didn't even start Elementary school.
And with FVWM literally you could mimick any interface ever.