When mesh came out, marketplace added the ability to state whether a item was "No Mesh", "Partial Mesh", or "100% mesh", as well if it is fitted mesh.
I propose that with the addition of PBR, it is made so we can see if something is using PBR with "No PBR", "Partial PBR", "100% PBR", as well as a flag called "Blinn-phong Fallbacks" (MAYBE? Since some people will be using non-PBR viewers apparently).
This will benefit creators and buyers in the following ways:
  1. Buyers will know if content is using PBR or blinn-phong.
  2. Creators will be able to clearly disclaim in a visible, uniform way that something has PBR without fallbacks.
  3. Buyers who use old viewers will know if content will be compatible with their viewer.
It would be useful if this is a searchable filter too!