Missing normal or height maps at smart materials

Hi,

why so many smart materials directly placed in Substance Painter have no normal or height channel/information?
For example:
"Steel Painted Chipped Dirty"
"Steel" or 
"Rubber Vulcanized Raw".
These are all amazing materials (in BaseColor, Metallic or Roughness channels)
but without any normal information (just plane normal map) it is useless. (((