Stupid non-web guy here. I don't understand why you can't just start publishing events, and if you need to change the event contents just create a new version

Stupid non-web guy here. I don't understand why you can't just start publishing events, and if you need to change the event contents just create a new version of the event and support the legacy clients until you can get around to rewriting them. If you can't control the clients and need to support the legacy events indefinitely... well, you probably would have had that same problem no matter what you did, right? This article seems like another instance of criticizing an oversimplified example of something.