I wouldn't say that: I believe subdiv convert the solid(s) in surfaces Nurbs! ;) like patches....
And you see them !

Can be less or more numerous (patches) depending of the Original OBJ and method used!

Here the Native SubD / Create from file


Moi is not a Poly modeler!
We can simulate Subdivision in it! ;)
Thx Max Smirnov!
Compare to this ligh one! :)
_Import OBJ