If I recall the history right. P4 didnt smooth, or didnt smooth as well as P5,6,7.
the only way to get smoother more "real" was to raise the poly count.

in addition it allowed for smoother morphs and previews.

even thought p5,6,7 has been out for years many merchants are still not optimizing their products for these versions. Some because they want to maintain (or did want to maintain) P4 compatibility to keep from loosing some portion of the market. Others keep doing what they have always done and dont realize the potential of the new versions.

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