This setting can be thought of as spatial inheritance - it inherits the
properties of its parent though spatial coherence is still maintained
(so its not a browser clone!).
Its a browser window. Spatial inheritance is so totally non-spatial.
When have you seen something "inherit the physical properties of
another" in the real world? ;-)
All classifications in the real world use inheritance (animal,
vegetable, mineral etc).
Anyhow its optional and intended for those wanting to combine both
worlds. Its not meant as a replacement for the default spatial mode
which is okay for newbies. But its still spatially coherent and it gives
the user far more control over either a pure spatial or pure browser
mode.