That's the ENTIRE point, though. The roleplay. DOS2 is all about immersing yourself in the world and making a character you have fun with. For some, that means playing the Red Prince or Sebbi. For others, that means making a stupid build that makes the game challenging in a different way.
And, for the record, Poison Bolt on a mage will heal more than any restoration skill BECAUSE the poison debuff ignores magical armor if you take the zombie talent. You get a truckload of frontal healing and a healing tick for 3 turns.