With PCB design, you can work at a few abstractions above that. For example, nets, and the various abstractions used in electronics (resistance, capacitance etc

With PCB design, you can work at a few abstractions above that. For example, nets, and the various abstractions used in electronics (resistance, capacitance etc). Even for RF and high-speed designs, I don't think that's an appropriate granularity to model the system with. I'm curious if that has any implications for future nano-scale tech; we might see an intersection of DFT and electronics design.