Good point. As I recall, DS9 also gave us our first Klingon lawyer, which was something we hadn't seen before but which made perfect sense. Every Klingon can't be a soldier.
They must have lawyers and accountants and architects and mechanics and housekeepers and doctors and nurses as well.
With a franchise as enduring as STAR TREK, writers are inevitably going to be looking for a new slant on Vulcans or Klingons or transporter accidents or whatever.
I also like the Klingon Lawyer in the ENT S2 episode "Judgement." He shows a more traditional nonwarrior side of Klingons.
He says this:
ARCHER: How many cases have you won?
KOLOS: Oh, I'm not sure. Over two hundred. But that was a long time ago, when the tribunal was a forum for the truth and not a tool for the warrior class.
ARCHER: There are other classes?
KOLOS: You didn't believe all Klingons were soldiers?
ARCHER: I guess I did.
KOLOS: My father was a teacher. My mother, a biologist at the university. They encouraged me to take up the law. Now all young people want to do is take up weapons as soon as they can hold them. They're told there's honour in victory, any victory. What honour is there in a victory over a weaker opponent? Had Duras destroyed that ship he would have been lauded as a hero of the Empire for murdering helpless refugees. We were a great society not so long ago, when honour was earned through integrity and acts of true courage, not senseless bloodshed.