Isn't the author doing the rational thing though? If I knew ahead of time that BigTechCo's final interview would be a test of my juggling skills, I would definitely spend hours honing my juggling. Whether or not it's an appropriate measure of my skill as an engineer is irrelevant to my goal of "getting a job at BigTechCo"
The author’s doing the rational thing, but BigTechCo that requires juggling certainly isn’t. It is left to the reader to decide whether this is relevant to the industry’s interviewing practices.
