Electronics is about building useful circuits. Do you really need to understand what precisely happens within any of the parts? No, not really. I can't imagine what happens to electrons in MOSFET nor do I care. For my purpose it represents some transfer function which is what I use to build the circuit. When I think about OpAmp, the physics is not one of things I am thinking. My mental model of OpAmp has no physics in it and it is about relation between input and output signals.
Think this way: do you need to understand how a complex IC part works? No, you don't. You read the manual and learn that if you put something on particular inputs you will get something on outputs. You leave designing the internals to others. You take parts other people built and solder them to long pieces to copper glued to PCBs.
That's really most of electronics.
You need to know a little bit of physics. You need to appreciate some phenomena like losses, noises, you need to know what happens at high frequencies, maybe you want to understand how heat is conducted away from your parts, etc. You need to know couple extremely simple formulae and laws (laughably simple to any physicist interested in the matter). Other than that your parts function as tiny little lego bricks that are transfer functions to affect how your circuit works.