**Khory,

The simple fact is, most products for Poser will work in Studio as well except for those cases where a product relies strictly on Poser shaders and materials or if it's dynamic. BUT...not every buyer will realize this and if the vendor cannot provide support for Studio, then that disclaimer must be placed on the product page. It's a sort of "Buyer Beware" type thing. If you see a statement that it was not tested in Studio and support for it's use cannot be be supported, then it's up to you to take the risk that you can make it work in Studio.

The other simple fact is that not everyone likes Studio and they have the right not to use. Being a vendor does not change that right nor is it written anywhere that a vendor must make a product for both Poser and Studio.  Personally, I gave up on Studio long ago when they came out with the version that you HAD to use in order to use V4.2. That version would not work for me regardless of what I tried and even tech support at Daz gave up on trying to get it to work. Since I can no longer support a product's use in Studio, I make use of that disclaimer myself. Not saying my products won't work in Studio. Just that I can't provide the support of them in Studio.
**