Bug report for devs:

    1) Edit a doc in tab A
    2) Open same doc in tab B
    3) Edit in tab B
    4) Edit in tab A
    Result: changes in tab A are not saved and there's no notice/indication/error message.

... now bugs aside, why would I want to use a text editor that isn't local?

Even assuming it works fine, what does this get me that $FAVORITE_EDITOR combined with the plethora of other sync methods (dropbox, google drive, onedrive, etc) get me?