Would we have this conversation if you considered people to be good enough drivers? No.
Most knowledge isn't, but the critical pieces will vary and some of them are yet to be discovered.
Biochemistry is there for the engineer (intentional implication). The benefits for the driver lies in understanding how the engine as a whole works and the consequences it has for the car.
For the average person, the question might very well be enough with is it good music or not? For a musician, the next questions become more important. What makes this music good? And why does it vary from people to people?
Sure, for most people it's sufficient with the knowledge from books and the most critical facts coming from science, or specilizing on the facts important in your own field. That's not a good reason to scrap science in humanities though.
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