To keep the history
ZARMS values keeping the history of decisions. “Why did we stop this?” and “Who handled this last time, and how?” are important clues the next time you do similar work. If you delete the card, you lose those clues.To keep docs and folders from being orphaned
When you create a card, ZARMS sets up a Google Doc and a Google Drive folder just for that card. The doc holds the description, and you can also write notes from meetings and discussions about the card there. The folder holds the deliverables. If you deleted only the card, the doc and folder would stay in Drive with no way to tell what they were for. Keeping the card keeps that link to the files.What to do instead of deleting
You can undo both Cancelled and Archive later. See When to use Done, Cancelled, and Archive.