It's location, it's also recognizing refineries in PADD3 are, in fact, technically specific and different from other regional refineries which cannot pickup the slack. Light/sweet vs heavy/sour geographic refinery mismatch are not interchangeable, some products other refineries can produce with low yield, some can't be produced at all. Hence specific highlighting their complexity AND productive/yield levels. US has never tried to survive this level of disruption, which is not to say it couldn't, simply it will be at levels that will significantly degrade CONUS beyond any historic comparison, enough to potentially constrain/deter US adventurism in Americas.

Some specific products like SPECIFIC mixes of aviation fuel, only some PADD3 refineries are setup to produce or produce significant % i.e. IIRC something like 90%+ of military JP5/JP10 come from PADD3. That's why I said "specialty" aviation fuel, not just general aviation fuel. Or taking out out Colonial pipeline which ~2.5m barrels - US doesn't have 10,000k extra tankers or 5000 extra rail carts in reserve for that contingency. Turning off export has nothing to do with this, there isn't enough to keep in-nation due to refinery mismatch, or not enough hardware to move it in event of pipeline disruption.

Of course predicated on timeline/execution, i.e. US can potentially fix refinery mismatch and harden/redundant over next 10 years. We don't know if/when Monroe countries will start adopting their own rocket force. Just pointing out after Iran has demonstrated defense is useless for midtier powers and mediocre offense can penetrate the most advanced defense, the only rational strategic plan is go hard on offense for conventional counter-value deterrence. The logic like Iran, it matters less RoW suffers more, only specifically that US suffers as well, the harder the more deterrent value. And due to sheer economic disparity, could be trillions for US vs billions for others, even if trillions for US is relatively less.