> OTOH, I don't like the current layer arrangement in PCB, which > provides separate tabs for metal_top and GND_top (i.e. plane), and so > on. There should be one tab per layer & you should handle plane > vs. routing layer issues using positive and negative layers.
You're talking about the layer groups. I think those exist just so you can have different nets be different colors, even when on the same physical layer.
