If code reviewers were just for checking mistakes, then unit tests would be enough. Code reviews are invaluable in education other developers about your code,

If code reviewers were just for checking mistakes, then unit tests would be enough. Code reviews are invaluable in education other developers about your code, how to support it and how to develop on it. But information should also flow the other way and the give the reviewers the opportunity to present the accepted practices to the developer. In the long term, this saves developer time as the code base stays coherent. Code is read many times and needs to be understood by many developers even though it is written only once.