30 seconds is useful if you need to keep something perma-mezzed. Getting the time reduction for daze is a trade-off for more damage. Usually in groups you do not need perma-mezzing, so you trait for de-buffs or damage. I have a red-traited LM that solos, so you can also employ it that way. If you destroy mobs fast enough you do not need more than 10 seconds of mez. You also have 2 other forms of CC : Roots and stuns galore.
Kinships: Fifth Star Vagabonds on Crickhollow (Dotswith); Random Access on Arkenstone (Dottiel)