Tactical? Oy vey, what a concept. Originally, it was meant to be a knife built for hard, rough use by elite forces who may need some kind of backup self defense ability - in a less than 4 inch blade that folds. That's not an optimum configuration for that job.
The Emerson CQC7 was one of the first popular knives, and got reproduced by Benchmade. It has a lot of features that are considered "de riguer" for the type - chisel ground tanto with serrations, G10 grip, liner lock, overbuilt, and expensive. Also, black, very black, as in blade coating and handle. No shiny reflections, no colored pakkawood, no polished brass, nada, and uncompromising design to get a specific task done.
It's not really the best knife for EDC - it's a limited cutting shape, the blade is wedgy and thick, serrations hang up in some cuts, handle slabs are a little thin for long work, all the bumps and corners can dig in and be uncomfortable. The maker thought so too, and did a "melt job" on the design for more casual users.
Other tactical knives came along, and the most pronounced characteristic has been the use of non-utility blade shapes in unergonomic handles and extreme macho military styling, with the worst case using extreme fantasy descriptions of how they can be used.
The better ones are still designed for rough use in the military, so they are still subdued in aesthetics, and use blade shapes and handles to complement the task list of the user and his environment. You will still see handles designed for use with gloves, not barehanded, droppoints, flatgrinds, framelocks or very heavy liner locks, G10 handles, and top end steels, along with prices to match.
What real soldiers in elite forces use is a dead reliable knife of premium materials, which leaves out 420 stainless, FRN, and fantasy designs. How some people include them in the definition of tactical is a real stretch - no professional would touch them, and those who point them out as typical in complaining about them miss the whole point. Really shows what their agenda is, whether sheeple or others.