What is the advantage of using this over action cable?

ActionCable would be more for server to client interaction and this kind of pub/sub technique would be more for server to server interactions.

Can this kind of event driven development be used to make updates in the view without the need to poll, for instance? What I mean is, if I have a Rails app that is using React for the frontend, is there a way I could subscribe to one of these events and update my component when something in a model changes, like the price of an item went up or the name of an article was updated, for instance?

 ☒ I would probably use ActionCable or something similar like that to do view updates.

Thanks! I'll take a look at ActionCable then. 

Does the notification doing the same thing in rails 6? https://api.rubyonrails.org/classes/ActiveSupport/Notifications.html