In reply to Andreas Nurbo.

I disagree with your equating this with the complaints about the Customizer. While the customizer changes the appearance of a theme based on user input, Post Formats ostensibly change the presentation of content depending on what format is selected. The problem is there is a lack of clear direction as to what exactly should happen when a specific Post Format is selected, and as a result the behavior of a specific post format can change dramatically across different themes. Unlike in the Customizer where the user can customize each theme independently, Post Formats are related to the individual post and will change with the change of themes causing an inconsistent experience for the site owner.