Coupled with the fact that it's a fundamentally unstable system to mate "highly transmissible pathogen" with "single layer of protection." There's a reason network security is migrating to zero trust, and it shares many parallels with pandemic modeling.
Yes, border lockdowns will work if a country gets lucky. How long can they stay lucky?
I'm also suspicious we can identify novel diseases fast enough (presumably in animal reservoirs) fast enough to be effective. There are too many unseen places on this planet, and pathogens evolve too quickly. Again, it only takes one.
What should be boosted and universalized is disease surveillance. The patchwork (nationally and internationally) systems for stitching together sample -> testing -> result communication could bear a lot of improvement.
Also “you are either in a pandemic, or you aren’t” isn’t the important part of a response framework. The far more important part is preventing novel diseases from becoming a pandemic in the first place, even if they have the potential to be.