Is this a real problem? It should be possible for Amazon to update their code to generate IDs a different way, and for them to update their client libraries wel

Is this a real problem? It should be possible for Amazon to update their code to generate IDs a different way, and for them to update their client libraries well ahead of a time when this becomes a problem. Yes, code that relies on the ID being a particular format will break. But users have to deal with deprecated client library features all the time. It's reasonable to give a few year grace period before old APIs are shut down. UUIDs are usually not simply random numbers. So it's possible to tell when a particular standard of UUID is used. Amazon's code can branch based on this detection, or even something simpler like "UUID-type", a new field that would be initialized by default to the old UUID type. I simply don't see this as a problem for anyone.