The whole reason computers work at all is because of the many many layers of abstraction. At some point everything seems like a mystical black box to you too.

Sure it might be at a lower level. But there's always a point where you get to "I just do this and it does what it says it should. I don't understand how it works." Do you feel like a terrible thing has been inflicted on you because you don't know how the Linux kernel works internally, or how `idiv` is implemented, or which SRAM cells your CPU uses?

You have to stop somewhere, and running javac manually is something almost no Java developers do so learning it definitely seems like a terrible thing to inflict on beginners.