When the only time you have needed to implement a sort algorithm in 15 years is for an interview, then it shouldn't be so controversial an opinion to say its a

When the only time you have needed to implement a sort algorithm in 15 years is for an interview, then it shouldn't be so controversial an opinion to say its a stupid way to interview. If the job involves writing that sort of algorithm by all means test for it, but the majority of jobs aren't.