12s do make sense in Healthcare where every handoff is an opportunity to miss important information. For instance if you forget to mention all the specifics of all your patients injuries after a car wreck, the next nurse might not realize their sinuses are cracked and just go ahead and insert that nasogastric feeding tube into their brain.
3 handoffs a day instead of 2 is 1.5 as many chances to make an error like that.
That said, 2x12s a week instead of 3 sounds lovely.