Stody12 , thanks a lot for your feedback!
1. I will of course gladly file and forward your inquiries to our developers.
2. It will work already, you will just have to set the Amount of "Bump" (after importing a displacement map into that slot) to over 500, this will ensure that we then activate the displacement mapping.
Also, I'm honest with your here, SketchUp does not have any priority compared to the other CAD solutions, it's just that things like implementing the displacement map functionality for example was a bit easier since we already have a dedicated material editor for SketchUp, but that material editor was only developed in the first place because SketchUp's materials options are not that great - compared to the material options you have in Revit though, everything is provided, so this already then results in great materials.
Still, we are definitely working on improving the usability of displacement maps in Revit as well. For the time being as mentioned above you can still already test it out if you set the value of your bump/normal to over 500.
About that 2.
In Revit from 2019 is possibility to add PBR textures to advanced material editor and after that renders are a lot better. You can add normal map, height map, roughness, AO and more, but with default Revit material editor you can not add these PBR textures , but bump texture yes. So maybe you are right you can add displacement to bump in default material editor, but this is absolutely useless, becasue render is really bad with default material editor versus advanced Revit PBR editor( where with PBR textures you are in the differente quality). In advanced PBR revit editor you can add just normal map or height map and with normal map max value is 5mm and with height map is it 254mm , but you cant do 500mm setting for bump map, so this is way displacement maybe working with default Revit editor but for users from 2019 this isnt option anymore.