Make SBSARs aka MAterials in material panel usable please

In current implementation  it 's absolutely useless . Please, give us an access to  height ,  roughness, etc  channels at least.      And  lets us composite / mix materials in Photoshop please.    I tried Sampler and I don't like it at all.  Would be so much more convenient to do it in Photoshop.    And I don't need any 3d preview at all, it never accurate anyway.   Just make live lighting  filter like in Affinity Photo. 

Please, just let the sbsar smart objects have  height and roughness layercomps inside we could switch to in properties panel.

Or better do the height as an extra channel like  in Corel painter   with add, sub  and height blend/depth combine  blending options.   Well, the  later  CorelPAinter  doesn't have really but why Photoshop couldn;t .Especially if it's recreatable by its usual layers.