I found the following post regarding the Ajax functionality:
The suggested solution was to use “The-Grid” plugin. But this is no longer officially supported by theme.co.
A deeper integration of Ajax functionality in cornerstone would certainly be the next big killer feature.
In your “Best theme for WordPress” post, you also mentioned DIVI, where such functionality is at least available as an extension.
I think theme.co should definitely go along with this, perhaps as its own extension?
What do you think?