This makes physics a lot more approachable for people who know nothing, but then completely confuses people with only a little knowledge.

My favorite example of this is the use of "stress" and "strain". In common language they're synonyms, but in Physics they're definitely not.

There isn't a scientific definition for "observation." In the Copenhagen interpretation, it really is treated just as vaguely as the colloquial definition, something the physicist John Bell complained about in his article "Against 'Measurement'", that the textbook axioms of quantum mechanics are inherently vague because they refer to "observation" or "measurement" which is not itself defined in the axioms. Saying that observation is just "when the wavefunction collapses" is a circular definition and doesn't answer anything, because then we can just ask, "when does the wavefunction collapse?" and the only answer the textbook axioms give is "when you observe/measure it."

"Theory" is another bad one in all of science. That's what leads knuckleheads from saying dumb shit like "evolution is just a theory!"

In general, I agree, but spin is quite surprising in how much like angular momentum and dynamos it behaves. Either way, we don't know enough about it yet, and it's at best a coincidence.