Give them a benefit of doubt, they may have a larger context and specific experience. Usually it is not that simple. The initial requirement may turn out wrong

Give them a benefit of doubt, they may have a larger context and specific experience. Usually it is not that simple. The initial requirement may turn out wrong upon user playing with the implementation. There may be corner cases, dirty data that will need manual or automatic cleanup. Simple query that runs just fine on a small amount of data chokes up on production database and you need to debug with query planner and introduce additional indices etc etc.