Some companies doesn't have enough people to review the code, at least not with the required seniority. This way there is also knowledge transfer, but to the co

Some companies doesn't have enough people to review the code, at least not with the required seniority. This way there is also knowledge transfer, but to the company. And with people not in your payroll that can provide objective comments since they are not afraid of telling the wrong person that their code sucks.