31ec6655_OSX_UI_Philosophy___Ken_Snyder__OSX
[0] Window Resizing [Windows & Linux] Utilitarian: Windows can be resized from any side, or, within a larger target in the lower-right-hand corner. [OSX] 
Consistency: Windows are only resized via a small icon in the lower-right-hand corner.
OSX UI Philosophy - Ken Snyder
OSX