Hey!
I am currently using icons to make template for my card deck. I thought it would be nice to make the base card an icon and disable "sync" whenever I work on a single copy. This way, I can adjust the size of certain objects later.
One thing I couldn't get to work is re-enable sync, after you changed a specific object inside the icon hierarchy.
Example: I have a card with a font inside it. Now I disable "sync" for the icon to edit the card's name. After re-enabling sync, changing the name on another card will no longer override the previously desynced card... Changing color/size etc does still apply, but I can no longer override the text change.