If the tags are anything like DWM or Awesome, they’re like traditional workspaces like you’d find in Gnome or KDE, but with the option to display multiple workspaces at the same time.
Example:
You have a “coding” tag that contains your editor and terminal, and a “browsing” tag that contains Firefox and Chrome. You can display the windows in just “coding” or “browsing,” or you can display all windows from both tags at the same time.
Not to mention, it’s a standard now, and the old Supercharger protocol is being phased out in favor of another standardized one (I forget which). Further development done on their chargers from here on out is going to be done by a consortium of companies rather than in-house anyway.