We survived the age of StackOverflow. I don't see why LLM's will be the death of critical thinking where all else has failed so far.
With LLMs, you don't even need that. Just copy paste the error and you get a response. Copy and paste the Jira ticket description and you get a response. This wasn't possible with SO. Yes, none of those will likely work straight away but the point is that less thinking is required.
Hopefully, the junior's code will be reviewed before it gets merged