That's not what HRs responsibility is. > How can your statement be largely true (90%) with all large companies having _dedicated_ HR departments with staff whose sole responsibility is to find the _best_ employees?

HRs responsibility is to protect the company from liability in hiring, firing, promotion, retention, labor relations, wage/hour rules, etc.

To the extent that part of their public statement of purpose is helping hiring managers find the best employees, that's mostly bureaucratic euphemism for “preventing hiring managers from indulging their own conscious or unconscious racial, sexual, age-related, etc., biases in a way which creates legal problems for the company.”

Cookie cutter approaches where everyone goes through the same checkpoints and they are weighed the same way, including cookie cutter technical interviews rather than a nuanced consideration of other factors that determines the need and coverage of a technical interview, is exactly what having a significant HR department encourages.