When I can get a good grip on a folder, the lock is reliable, and the opening is smooth, I can begin to consider it a tactical folder. The Delica is not for duelling, but it is suitable for getting you out of many 'tactical' situations. A serrated version would help you cut lines and the like in an emergency, as well.
I suggest you get the trainer, and a willing training partner. Taht way you can find out f the Delica suits your 'tactical' needs. The Delica's blade is plenty sharp, the point is stronger in the latest version. But the blade 'design' is one of the last things I look at for defensive cutlery.
Wouter