My thoughts are, since Microcosm and Sadism are followed nor enforced, that duellist status is a way to counter that. There are times I want to fight, and there are times that I don't, and without duellist status, I don't have that choice. I am hunted and attacked daily, multiple times.
Yes, you can there are ways to avoid it. Like? Sitting in the Pool or a stockroom or barracks and not gain any lessons, or sit under Divine Protection and not able to use my skills to help the city(NON-Fighting) stuff.
I would even go as far as saying the FIGHTERS who complain about duellists would like the idea, as there would be more of a chance that someone wants to fight. But I'd much like the decision to be mine, not the jumper/attacker.
And... help files can be changed.
We all know that there are people who all they do is jump,attack,kill,fight 24/7 and only stop to refill their pots and pouchs. This is a counter to their sadist ways giving people more of a chance to learn at an easier pace. Might even stop those bullies who like to strip the month old youngins'
Written by my hand on the 3rd of Ilmarael, in the year 1217.