Generally, for low-poly models, they need to have things done to them for Poser that don't need to be done for other apps - depending on what is actually done, the model can look very close to the same in a variety of apps, but yes content can be interchangeable.  The trick of breaking edges leaves you with geometry that isn't suitable for use with Catmull-Clark subdivision (what most other apps use) but that doesn't mean you can't render it just as it loads.  For high poly content (most Poser character and clothing items) this usually isn't a big concern.

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