I.e. senior review is valuable, but it does not make bad code good. I suspect that isn't the goal. Review by more senior people shifts accountability from the

I.e. senior review is valuable, but it does not make bad code good. I suspect that isn't the goal. Review by more senior people shifts accountability from the Junior to a Senior, and reframes the problem from "Oh dear, the junior broke everything because they didn't know any better" to "Ah, that Senior is underperforming because they approved code that broke everything."