I think another aspect of this is the mismatch between most interview environments and the working environment on the job. Even if you are prepared to do the job, you might not be prepared to succeed at the interview.
Very few people function the same way in a high-pressure evaluation as they would in an average working day. It is impossible to assess somebody's knowledge of such a wide field in such a short time. Interviewers know this, but I think they are put in a difficult situation too. I think a short-term paid working engagement on a small project or feature is the best way to assess a candidate's skills, and provides the best opportunity to the candidate to know what working there would be like. In my experience however, it's rare that companies with job openings are open to that.
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I think another aspect of this is the mismatch between most interview environments and the working environment on the job. Even if you are prepared to do the job, you might not be prepared to succeed at the interview.
Very few people function the same way in a high-pressure evaluation as they would in an average working day. It is impossible to assess somebody's knowledge of such a wide field in such a short time. Interviewers know this, but I think they are put in a difficult situation too. I think a short-term paid working engagement on a small project or feature is the best way to assess a candidate's skills, and provides the best opportunity to the candidate to know what working there would be like. In my experience however, it's rare that companies with job openings are open to that.