Somehow, I think people assimilate the word 'tactical' with 'one hand use.' You know, you're at a crash scene, the driver has had a heart attack, the gas tank is smoldering, and you are busy. You flick the blade open with one hand, cut the seat belt and then have to secure the knife.
I think most people envision themselves closing a liner lock one-handed to facilitate the quick use of both hands on the victim. If time is not a problem, then the concept is that this is not a crisis 'tactical' situation. To that end, I think lockbacks represent strength, more to a survival or hunting situation. It's perception.