I think the problem is best seen by considering the statement "You don't care who subscribes to your events." This is great when you are literally doing something only on one end of the event creation barrier. This makes sense when creating something takes a lot of effort.

However, for many many shops, this is an abstraction they will never get to. They care intimately about who will subscribe to the events they publish, because they are planning on doing something as the primary subscriber.