I think so many texture artists are just so used to painting them on the textures that they never gave it a second thought, because that's how most other people did it, and customers seemed content with that setup.

Also, while people kind of lump content creators into on big ball, many reqlly good modelers can rig, many riggers can't model with style, and many texture atrists know little about technical aspects of poser. So many people just were content using P4 for SO many years, that they never bothered to learn any new features at all.

I think a LOT of them picked up P5 free or cheap, and are now fast tracking towards the newer versions because customers are now more savvy, and are now demanding the new features be used.. and that's good for everyone.

Way too many people take way too many things way too seriously.