@pseudonym That is why they don't replace juniors in aviation, nuclear, and radiology - only in non-critical industry.
If the cost of potential failure times the estimated failing rate is smaller than the total labour cost of screening, interviewing, training juniors, plus firing cultural misfits - then business replaces it.
Not only it saves HR operating cost and internal training cost - they can also hang a mistake on a senior reviewer.
And the review model has a positive productivity projectile as they have a stable improvement curve, unlike human.