It also surprises me that these lessons originated in 1971 (though I had not heard of this text until just now.)
Back then, IBM was hiring English majors and training them in assembly to work on OS/360 etc. It would not have occurred to me that developers back then would have cultivated a stereotype of a "prima donna."
Because to me, and perhaps this is a reflection of my age, it has only been recently that the popularity of joelonsoftware-esque "pamper your developers!" has led to a culture in small companies where we demand free beer and 36" Macs as a condition for employment.
Or has it always been that way for developers (of young tech companies; none of this really applies if you work at Fidelity Investments) modulo the greatest tech of the day?