Yep, we're all creatures of habit and when people quit getting real tags in advance they panicked. The cruiselines didn't want the printing and shipping expense of just sending tags when the whole purpose of going to e-docs was to cut out millions of dollars in shipping costs. At some point people will get used to the idea that bag tags are not needed in advance of arrival at the pier. Until then, the folks who just have to have them because they always did before can continue to print the paper ones and rig them to stay on their bags.
By the way, the airlines hate to have cruiseline bag tags on your luggage as well. They're just one more thing in the way when they're trying to process your luggage with their info attached. For everyone out there printing and laminating, it really would be helpful to all involved if you did the tags at the pier.