A generic course in QM won't really help you understand electronics any better. Perhaps if you have a background in electronics or if the course makes attempts to link QM with electronics but otherwise it's just relatively abstract physics.
If you E&M questions are just node solving, linear algebra and difeq is all you need for E&M to solve "most" work. You do a lot of specialized versions of that in QM and as mentioned above the people doing the actual semiconductor design are so highly specialized that they are often not transferable to other problem domains and require fundamentally different approaches. Not sure any non-PHD study will really help one advance the field in a meaningful way. Study of QM i would say sufficiently enriches all physics verticals that if you are capable, it's worthy of individual pursuit, but also makes total sense to study as part of a curriculum taking place after intro E&M.
Quantum Tunneling in everyday life: https://www.discovermagazine.com/the-sciences/how-quantum-me...
Caltech had an elective course for freshman about how semiconductors worked up through flip-flops and registers. I took it. It involved QM and yes, tunnelling. So it's doable for mortals.
I read Charles Perzhold's Code, worked through parts of SICP, developed a bit of high level code software, have a very good knowledge of chemistry, lithographic processes (and QM, half forgotten by now). And yet it is not enough to get a good understanding of the modern computer - EE, compilers, OS de, networks, ... wiring the while thing together, et cetera.
I see the point in historical approaches, but it is quite time consuming. At the end, you will most likely attack problems at one to three levels in the "stack".
What would you consider to be an above average conceptual tool and skill set for the modern hacker?