Color-coded organization
A managed tag catalog keeps naming consistent across the whole organization, not just one person's habits. Instead of five different teammates independently inventing their own tag names for the same concept — "prod," "production," "live" all meaning the same thing — everyone pulls from the same shared list, so filtering by a tag actually catches everything it should. It's a small amount of upfront discipline that saves a lot of confusion later. It keeps a growing list from turning into a patchwork of slightly different names for the same thing.