Recent comparisons list requires explicit "Open" after selecting a list entry
When the "Open a recent comparison" popover is displayed, clicking a list entry merely selects it. The user is forced to either double-click, or explicitly click the "Open" button, in order to open the comparison.
But double-clicking is an awkward and unfamiliar semantic for list items, and the list doesn't support multi-selection, so there's no real advantage to preventing activation with a single click.
(Selection without activation using keyboard navigation, as well as right-clicking an entry to access its context menu, could still be supported in a single-click-to-open scenario.)