It's just the way people see duels here, your definition of duel just differs from them, nothing else. If at any, I'd recommend you to fight with yggs. They are not abusive, they just bring a new level to the duel. If, let's say, your enemy's build has the upper hand in the fight, yggs will help you have more chance to come up victorious.
For example, it's quite hard to battle SB sinx's without yggs, since they can, most likely, kill you in one or two hits. Yggs would give you an actual chance to battle them, if you were to survive one of their SBs.
I say this from experience. I used to complain about yggs as you do right now. After I experienced battling using yggs, I discovered that they are not a definite win, but just another variable in the fight.