When I create a tablet/desktop/phone version of a site, why are all the pages blank?

Question

Hello, longtime listener/user, first time caller
I've been using Muse since jumping on the Creative Cloud train a couple years ago, but to date all my experience had been in maintaining and updating a desktop version of a couple small sites.  I loved the idea of Muse being able to assist in the creation of separate desktop/tablet/mobile layouts (ie responsive design), and this past week was my first experience in using it as I worked on a ground-up rebuild of http://www.eridusociety.org.  I started with a Phone layout, with the intention of getting that right and then expanding outward to a tablet version, and once that was finished, adding a desktop layout.
After completing the mobile site and testing it on Business Catalyst (thanks to all involved in that seamless integration, by the way), I clicked on the +Tablet button and proceeded to build out the tablet layout of the site.  To my dismay, all the pages it built were blank.  I tried deleting and re-doing it with different combinations of the options checked, to no avail.  Then I raced off to the nearest web browser and started searching - surely I missed a step, or the great collective brain of the internet could alert me to some way to achieve this.  Alas, no such luck. 
The blank pages are intentional, and the way to populate those blank pages is to go back to the phone layout, open the page, then copy all the content, then switch back to the tablet layout, open the corresponding page on the tablet layout, and paste in the content from the source layout... and of course, rinse and repeat for the desktop layout as well (though for my workflow, I copied the finished tablet layout pages to create the desktop version).
For me, starting with all the page elements from the source layout is much easier than starting from scratch on each and every page.  That way I know I have all the elements on the page, and I can add to (or subtract from) as well as modify the layout in fairly short order.  I've been driving myself a little crazy with all the bouncing back and forth between layouts to copy/paste elements as I work on my site, and for future reference I'd like to know if there's some way that can be avoided in the future?
Ideally, I would like to see an option in the create layout dialog box to be able to copy content (and choose the source layout to copy from). 
Beyond that, another great option for this dialog would be to let me choose to switch all the page links to the new layout.  That is, when it copies and pastes all the page content from source layout, Muse would then also update the links to pages within the site so that they link to that layout's pages.  So when I build a phone version and click +Tablet, I can check a box to copy page content from source, specify that source, and then check another box to update links for layout.  After Muse does its magic, I have a tablet layout that's already got page content on it, and it's linking to other pages on the tablet layout (and not to the source/phone layout pages).
Thanks to everyone on the Muse team for a pretty great product, and to the people manning the Twitter account for responding to my tweet and directing me here.

Answer 1

Sanjit, I think one of us is missing the point.  It could be me - is there some way to easily and quickly pop open multiple layouts and pages?  Because for me (running a 12-core Mac Pro with 64GB RAM and FirePro D700 GPU's), Muse lets me switch between one layout view and the next (not open them simultaneously), and takes several seconds to do this every single time.  Opening and closing pages (to create separate tabs/windows) is also incredibly tedious. 
I can appreciate that select and drag works just as well as selecting all and using copy/paste shortcut keys, but that is the least time consuming part of the process.
Without copying the page contents from the source layout and transpose internal page links to new layout, Muse falls short of the mark of making it really easy to build responsive sites.  It's kind of like trying to take a cab to a destination across town that makes you get out and walk halfway.  No matter quickly or easily the cab made it through town, it still only got you half way there.