I think these things are entirely reasonable for a beginner to learn about. It teaches you about the machine, about the very real cost of a UART write. That saves you from inevitably spending hours and days to figure out that too many printf is what's making your program slow.

A beginner should be introduced to the processor, not C++ or python abstractions. Those abstractions are good and useful in the general sense, but you really should be aware of what your abstractions actually do to the physical processor.