The most recent release notes still state "Exporting a story to PowerPoint limitations: Titles are not rescaled as HTML, font settings are not yet exported."
Stories are a powerful tool for some of our teams to put together presentations rapidly using their Qlik Sense apps. The pivot table makes the header fonts way too tiny. This is easily fixable for interactive work, but once it is exported to a PowerPoint file, all of the styling options are removed making the font hardly readable again.