> it's absurd to think that nobody is going to pull releases before the default cool down period.

Why is that absurd? It seems like a more likely outcome than just assuming there are enough "security researchers" out there doing this for every package?! IMO both sides here seem to have no evidence that the other is wrong.

Because I can always bump up the cooldown period. I'm not naive in thinking that I never have to worry about anything with a cooldown period, but having rolling releases is inherently what cooldowns give you. Companies have been doing rolling releases on their own products for years because it's a lot easier to handle when something falls over for a small percentage of users that when in nukes everyone all at once. That same concept still applies here.

Because security companies/researches are doing just that. The vast majority of recent supply chain attacks have only lasted minutes to hours. A large portion of them were credential losses or tag takeovers that aren't hard to detect, but by the time you do, your CI/CD has already downloaded and ran the attack 200 times.