Even assuming LLMs produce code on par or far superior then most SWEs (Tbf considering the state of the field I could buy that) the fact it produces more exponentially more code means there will also be substantially more bugs. If you believe that agents can simply catch all the bugs you are delusional and have never had to deal with the consequences of this shit. Have you ever had to calm a customer down and serve as pr when they start asking you why there are substantially more critical bugs which require mitigation or education days before major upgrades?