If you know how to PK or intend to solo pk, you NEED to have two different styles of combat. Thus, getting ancient magicks is essential to this. Protect magic after you hit 70+ mage, until then protect defence. IF you do get accepted into the clan as an official AC, then being just a ranged tank should be fine, as many will have freezes.
In the end, it's about what YOU want as a player and what YOUR capabilities are.