The pager attack did change the world in two ways: the obvious one is where your point is most accurate (people becoming aware of how fragile supply chain are - just think snout what a terrorist could do with Amazon’s comingled inventory and returns!), but the other thing it did is start to legitimize this. If it’s only the Unabomber doing something, it’s clearly indefensible but as states use it other people will start to justify it on those grounds.
Hezbollah is hardly a sympathetic target but I’d be shocked if someone in the region doesn’t try to attack Israelis this way saying it’s not a war crime for the same reasons.