Yeah but Electromagnetics is the DEEP magic behind electronics.

You could, if you wanted, use quantum mechanics and electromagnetic field theory to do circuit design. But unless you're building quantum computers or doing simple circuit analysis and wanted a real challenge applying Kirchhoff's Laws, there's no need.

So you can use the simplified electronics model where the current (and therefore primary charge carriers) is positive.

Source: I am an electronics ~~wizard~~ engineer.

Electronics is a field that applies electricity and magnetism to make useful things.

No, That’s electrical engineering.

Electronics is specifically the study and application of devices whose properties are determined by the charge carriers themselves (the electrons), ie. band gap semiconductors.

Whether it’s science (physics) or engineering (EE) depends on why you are doing whatever you are doing. Understand stuff? Science. Make stuff that does stuff? Engineering.

Of course, there’s a lot of bleed and cross pollination on the bleeding edge. This is known as the science/technology feedback loop.

So then Bridge Diodes are not Physics.