Gaming

OK so this is now offtopic for the conversation, but...

However, that’s not the way artists traditionally work.

To some extent, it's authoring tools which affect how they work. A procedural materials pipeline can help them compose on top of already procedural content. In a way, you could see PBR as a part of that pipeline because PBR materials are physics modelled. Having said that I do take your point, even building out that pipeline takes time. Creating a PBR materials library is not super easy, and obviously organic stuff is very hard to model as a material.

meshes made up a significantly larger amount of RAM usage

From watching blender modelling, I thought the pattern was to have minimal rigging on the base mesh and then tesselation via normal maps + subdivision (apparently this is very doable even with sculpting). Obviously for animation you need a certain quality but beyond that I thought everything would be normal maps, reflection maps, etc etc.