Setting a swarm of agents loose for hours to look for software vulnerabilities is far more compute-expensive than fuzzing. The industry has never thrown this kind of compute resources at pure fuzzing, in part because you can't get much VC money for that.

Fuzzing or having the LLM sort through where might be most useful to fuzz & sorting the results? Neither seem particularly compute intensive to me, fuzzing is a pretty standard step and having the LLM read through to find the most interesting areas to fuzz sounds a lot more efficient than leaving the whole task to the LLM.