While I'm no big fan of a separate mesh for the brows, I will say this: Eyebrows DO cast shadows. Granted they're not very big or visible, but of course they cast shadows. They're not painted on your skin IRL :)

Also having a separate mesh makes it wonderfully easy to change colours on them while still using the same texture. Yes, this can be done with masks as well, but apparently very few people knows how to use those. I'm not even sure I could do it without looking somewhere first myself.

Hiding the eyebrow mesh is easy. I can include that morph with no problems (or you can do it yourself, ODF :) )

Another thing is.. if the mesh for the head is changed, none of the existing face morphs will work any more. At least mine won't. And since I'm not too keen on making all 80-something morphs again... I'm all for keeping the eyebrow mesh ;)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.