But so does CR 1, CR 2, CR 3, CR 4, CR 5, CR 6, and so on. What makes CR 19 special?
CR 19 SHOULD mean that it's a challenge for a level 19 group. That's the only metric that makes sense for a CHALLENGE rating. If the CHALLENGE rating means that it's no challenge, doesn't that seem like a nonsense metric to you?
Except people here are saying, and correctly so, that he'd get the tar handed to him by a level 14 group.
A CR 19 should be a challenge to a level 19 group, dangerous to 16-18 groups, and should wipe the floor with level 15 and below.