An analogy from the United States: after the September 11th attacks, one of the side-effects was standardization of the emergency responder radio codes at a national level. Previously, each jurisdiction had its own radio short-number codes; they worked in the jurisdiction just fine, and were incompatible cross-jurisdictions. This was generally a non-issue, until the friction from NYC first responders and Jersey first responders needing to inter-operate under a shared command structure revealed what a problem it was.

There's a perhaps surprising number of things that are not done in a standardized way. Firefighting in general is still done in a very local fashion vis. best practices, equipment, etc... With the exception of the radio codes and the national / international standards for labeling shipping containers (necessary because if a firefighting team rolls up on an overturned tractor trailer engulfed in flames, they need to be able to tell quickly whether the trailer contained the sort of thing that pouring on water will douse or the sort of thing that pouring on water will cause spatter or (much worse), violent combustion / polymerization reactions.