I've received plenty of negative feedback on the internet for this (and up to now, discarded all), but I really don't think acceptance review is the correct time for guidance.

Yes, juniors need guidance. That means you must read their code, and talk to them about it. They also need real-world feedback. They do really need you not managing all of the interaction they have with the real world. Now, what you can not manage is up for a complex risk analysis, but they really need you to get out of the way at some point.