No because on the defense side you need multiple layers of approvals to change anything. If not you have an LLM making production changes that can make the posture worse, or take down services, which is also bad.

Once a vulnerability is discovered however if it's in your own software a patch has to be written (without reducing functionality in most cases), tested, and deployed. At every step there will be others arguing about whether this line could do better, my service requires this thing that isn't included. So at every step the patch can be delayed.

And if it is someone else's software you will be lucky if it's open source and you can write a patch yourself. If it's closed source or a vendor you have to completely rely on them and use whatever your account rep can pull.

Attackers have a massive advantage with AI, partially because the defensive side doesn't want to make their side worse by giving a ln LLM admin access to all their data

Yes, but the defenders need to make money to fund their work and be right every time to be effective, and have a high degree of accountability if they fail to secure stuff while attackers can be less considerate of how they spend their resources and have less accountability for the havoc they wreak while attempting to extract value.

Not every defender is determined.