It's a Minor Trait, so you will always have it, no matter if you are running a Power or Condi build.Giving it both is probably less to encourage hybrid builds rather than making sure to facilitate both Power and Condi builds, and not making the Trait essentially just be a negative if it just gave let's say Condition Damage and you were running a Power build. Sacrificing 300 Toughness, especially as Heavy Armor class, for 300 Power and Condition damage is a pretty decent deal, even if you are only fully utilizing one of them. Especially on Warrior, which has the highest base health as well. It essentially makes you a Light Armor Class with the highest base health, comparable to a Necromancer, while gaining extra Power and Condition Damage. Assassins Signet gives you 540 power for 5 seconds on a 20 second Cool Down, and has a much greater opportunity cost of being an Utility skill compared to a minor Trait, which makes them hardly comparable. And who knows, maybe a Grieving Berserker with something like Flame Legion Runes will actually work well, but regardless, I'm not sure it helps to say Hybrids never work well while criticising trait additions that may be incredible potent for hybrid builds, potentially facilitating them, as useless. I'm certainly excited to see how this performs first once it's live, and it's been a long time since anything on Warrior excited me to try it out. This is one of those situations were I hope people like you is right and I'm totally wrong, I just love my warrior.