Why not turn this "global class data" into simply global variables?

What makes that "global class data" different from global variables in that package?

In reply to Re^3: Can a class constructor create an instance of a derived class and return it? Or, can objects transmute into other objects? by Corion
in thread Can a class constructor create an instance of a derived class and return it? Or, can objects transmute into other objects? by poodad

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