The same as asking one of your JRs to do something except now it follows instructions a little bit better. Coding has never been about line generation and now you can POC something in a few hours instead of a few days / weeks to see if an idea is dumb.
LLMs can easily output overwhelming quantities of code. Junior devs couldn't really do that, not consistently.
Scale/quantity matter.
This industry is not mature enough for 1000x the bad code we have now. It was barely hanging on with 1x bad code.