It may not guarantee less mistakes but it will make them more cautios while they work if they know that they'll probably be riding along on the first flight after the work is done. This would imply less mistakes.
So that would mean that pilots hardly make any mistakes? What utter tosh!
As a human factors expert well versed in the art and science of error I can assure you that is not the case. For example there is no evidence that more errors happen to operators of unmanned(unpeopled?) aircraft than piloted vehcles. In fact, the ability to do effective compliance monitoring on the ground means errors are less likely.