Funny story, years ago I was commenting in a thread here regarding eyes. Bagginsbill was in the discussion. Anyway, someone asked what's the difference between claw shell styled uv maps for eyes opposed to the split hemisphere style. I commented that a lot of times the back half of the eye's UVs would have a lot of texture stretching with the split hemisphere, and pointed to Bagginsbill's BBEye as an example of that stretching. As opposed to, say, V4's eye maps that don't have as much stretching.

Bagginsbill countered "well who's ever going to look at the back of the eyes?"

I responded "who can say to what purpose a model will be used by someone?"

Hence all of the Daz millenium and Genesis creature morph packages. Some people like that sort of thing...