Prices drop and people spend less? That's silly.
So silly that it's exactly what happened during the Great Depression.
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Your attitude is creating a culture where nobody cares and it's why many good engineers end up hating their job.
it's especially galling if the original PR was working, reasonably well written, no major flaws and they forced the junior to rewrite because it wasn't "best practices".
Some of the comments here seem more like sabotaging junior developers career by drawing out how long it takes them to get through code reviews than teaching them anything.