I think this may go along with other requests related to copying/moving elements from one page to another, but this one may be easier as a starting point.
If I duplicate a tab on a record detail page, I would love for it to duplicate all elements of that tab.
My current use-case:
I’ve got a tab already created called ‘My tasks’ which, as it states, is a page with several elements (including a few statistic chart blocks, a collection grid view and a collection calendar view) all filtered to Tasks assigned to the user. I went to duplicate this layout for a tab called ‘Tasks I’ve Assigned’, to use the same layout and update the filters, but none of the page elements copied to the ‘duplicate’ tab. It’s seems that the ‘duplicate’ button on tabs, in essence just creates a new tab.