Make it mandatory
You have the option to make labels mandatory, just in case your team needs that extra push. When labels are mandatory, nothing can be published without a label.
Label groups make it easier to find what you're looking for, categorizing terms, such as document types or departments.
Labels make search more powerful. If you're looking for an invoice, just search for the customer name, select the label "Customer Quote" and it is right there - no more sifting.