Ok little Tao history lesson 
Back when Mir was introduced the Tao class was a semi melee skilled class it used DC and accuracy to aid its attacks and give Skelly attack boosts MC also Boosted Shinsu 
The evolution of the Tao over the years has moved away from heavy DC and more to SC as spells and damage now come 99% of ranged attacks and The SC multiple s boost all pets now 
Back in the day was deadly combo of muscle ring  Heavy Armour and DragonSlayer on a Tao your skelly hit like a train all you had to do is heal your skelly and shroud yourself to kill most everything ingame …..
DC still helps today but it’s not as significant as it once was , I still max orb DC and MC on my kit out of Habit aswell as accuracy but haven’t ever used a melee attack  skill in years hehe 
 
Agility however still a very useful addition but really a Tao should be mobile always on the move and not take physical hits from mobs 
As I don’t PvP I find agility useful. To get out of those tight scraps  or when repulsing mobs away as damage mitigation exercise or those Taos who like Devils Vision tend to stack high agility……
Why don’t new kit have high DC I suspect as it’s not the damage multiplier anymore SC and SA are now and Scorps path for the Tao in future is more magic based range damage ..,