I do not know a thing about postwork :D Meanwhile I do know a little more about Poser. So I am trying to do as much as possible with Poser. I'd say, it's all about what you are going for. Do you want to create an image and Poser, Photoshop, whatever are just tools, or do you want to see what you can do with Poser, or what you can do to a render with another program? So I wouldn't call myself a Poser purist even if I wouldn't use any other program.

Yesterday's the past, tomorrow's the future, but today is a gift. That's why it's called the present.