[valicord]

> why are we not testing for that iceberg, instead just scratching the surface

Typical interview loop includes more than 1 question.

> how many times does a great engineer need to prove that they understand fundamentals?

This is a logical fallacy. The interviewer doesn't know if the interviewee is a great engineer or not, that's the whole point of doing an interview in the first place.

[throwaway2037]

    > Typical interview loop includes more than 1 question.

In my interview experiences, programming problems are "fail fast". If you fail one, you fail the whole interview. There is no "round 2".