If postwork helps, by all means use it. Personally I've been afraid to use postwork after having spent countless hours arranging objects and lighting and importing from Poser to Bryce and all that. Any postwork would either be lost and have to be redone if I did any future rearanging, or I've locked all my objects into position permanently by adding postwork. It kinda scares me, so I've been trying to avoid the potential trouble I see there.