Delaying PoC raises the cost of exploiting the vulnerability; having it makes it easier to exploit and not having it means an attacker needs to invest resources

Delaying PoC raises the cost of exploiting the vulnerability; having it makes it easier to exploit and not having it means an attacker needs to invest resources recreating it. How much this helps depends on a lot of factors, but it doesn't seem unreasonable to me to allow some time for users to patch before releasing the PoC.