Synchronize multiple account groups in Desktop App
TSM addon does not synchronize groups across multiple accounts because it would take too long. (It is a lot of data and Blizzard limits the bandwidth.) Right now it is a very manual process to export and import any group changes. I'd like to see this group synchronization done via the Desktop App to circumvent the limitation. (Hat tip to Bart39 for the suggestion.)
As of a few releases ago, you can now export/import the subgroup structure of a group. Marking as declined since this request is now moot because of this.