[Interest] Is the OpenGL vs Angle distinction important for widget apps?

[Nikos Chantziaras]

For applications that don't use Qml and only use QWidget, does it matter 
whether Qt was built with OpenGL or Angle on Windows?

As far as I can tell, GL/Angle is only used by Qml. Is that true? Can 
there be any circumstances where a non-Qml application might error out 
if running with an OpenGL-based Qt on a system with an old OpenGL 
version? (Meaning the default one from Microsoft which only supports 
software OpenGL 1.1.)