I think that trying to let things clear during the interview helps the candidate to understand the importance behind these kind of questions. In one of the process I participated the interviewer explained that solving the string problems I was facing was not the point. He explained the time constraints the projects used to demand in the company and for that reason code performance and complexity concerns would be also evaluated. String problems themselves probably do not represent the scenario a candidate will be working on, but perhaps telling about the skills required to not hit the iceberg helps to care about its top.
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I think that trying to let things clear during the interview helps the candidate to understand the importance behind these kind of questions. In one of the process I participated the interviewer explained that solving the string problems I was facing was not the point. He explained the time constraints the projects used to demand in the company and for that reason code performance and complexity concerns would be also evaluated. String problems themselves probably do not represent the scenario a candidate will be working on, but perhaps telling about the skills required to not hit the iceberg helps to care about its top.