You can ignore that, it is the result in change of input parameter type. node inputs and outputs used to be strongly typed, but that meant you couldn’t directly plug a color into a vector input, or a value into a color input. I haven’t added yet the necessary cases for GH to not complain about them (or maybe just ignore warnings altogether, don’t know yet).
Displacement probably doesn’t work properly yet, I haven’t put any thought into it, nor have I tested it.
That said, bump maps should work just fine, as well as the normal input into the principled BSDF.
Here is a simple anodized aluminium setup:
anodized_alu.3dm (549.9 KB)
anodized_alu.gh (15.4 KB)
And a version with bump node used (with size of noise changed so the effect is more obvious):
anodized_alu.gh (18.3 KB)