the screen should refresh automatically or somehow indicate to the user that the stream was created and they need to refresh. right now, it isn't obvious that i need to refresh to see the newly created entity.
Revisit the improvement in 4.1. The design for 4.0 is implemented as it is.
This should apply to all entities created from the home page. Once you create the entity successfully, the page should refresh with descending creation time as sorting order.
However, this is still a best-effort sort of fix. Since if the selected filter does not include the entity you created, it will still not be shown. That problem can be fixed using Call to Action as part of CDAP-8100.