Yes and no.
Yes, it’s correct that some time-based consolidation occurs and as a result, not all change events that occur on a task show up in the task’s stories.
But that consolidation also occurs in the UI display of activities on a task, so in other words, what gets returned by the API should match what displays on a task in the UI.
@Florian_Schoppmann, I wonder about “task created”, though, as shown in your screenshot - I’m not positive that particular event is included in stories. I don’t see it in the list of story information shown here detailing what gets reported: No more parsing story text! New fields on stories!.
If you make additional changes on the task, such that those are displayed in the UI for the task, do you then get those stories returned via the API?