There are also places where the incentives just are not there for in depth code reviewing. You could work in a culture where you are literally hurting a junior'

There are also places where the incentives just are not there for in depth code reviewing. You could work in a culture where you are literally hurting a junior's chances of promotion by being tough on their code and asking for changes, because their peer on another team is getting twice as many tickets "done" because his team just "rubber stamps" LGTM on everything. Many teams would never actually put in the effort to trace issues back to individual failures in a code review process, when they could be spending the time just fixing the problem and moving forward.