RE: Eliminating a couple of independent face definitions

[Drew Adams]

> > Sure - just use a copy instead of a pointer.
> 
> Having D copy from B is equivalent to having them both 
> inherit from a new face A with B's previous definition.

It is certainly not equivalent.
Just customize A to see the difference.

> With the inheritance, the user does have the option
> to change both of them at once if desired.

Precisely why they are not equivalent.  Read the thread, if you have not
already, for why inheritance is not the be-all and end-all.
 
> And we already have inheritance.

Hammer...nail.