Visual Treatment of Window Borders in Bluecurve

The (wonderful) BlueCurve theme seems to have eliminated any visual 
distinction between window borders and the contents of the window. It 
has also eliminated the visual distinction between resizable and 
non-resizable windows (was there ever a distinction?).
This does simplify things visually, which is nice – but it does force 
the user to guess whether an window is resizable or to fish for the 
resizing cursor.
Any thoughts on this? Was this simply a known trade-off for aesthetics?

Thanks,
Steven Garrity