Tags are very useful for when you're needing to track specific keywords in a ticket or for internal tracking of uncommon issues that don't need a field created.
To help us know when a specific Workflow has been used on a ticket, we add a Tag to the ticket. In theory, this would allow us to have a condition in a Workflow to check if another Workflow had been triggered.
However, Conditions do not provide the Tag field as an option.
Being able to check if a ticket has a specific tag can be very useful and possibly powerful in Workflows. It would be great to see this added as an option.
Great input, added to backlog