I agree with most of your points. However, while I agree that Opera tab stacks are better for grouping than Panorama, they still require a manual effort to arra

I agree with most of your points. However, while I agree that Opera tab stacks are better for grouping than Panorama, they still require a manual effort to arrange them. Also, expanding the group to view the tabs in that group returns the tab bar to the cramped state where it's difficult to identify tab contents, while a vertical listing alleviates that problem. Pinned tabs are magical. :)