Exactly this. Also, how is that you are crying to balance swordies around that much, but you are not complaining about archer and wizard soloing the content which shouldnāt be soloed?
Now: āBut these classes has these purposes.ā
On otherhand if we say that basicly if we think about it, swordies should be able to do that too, itās not ok, cause they shouldnāt have a damage to solo them? Ok, then you shouldnāt have the ability to kite/tank them.
So, either bring swordies to the same level or nerf other class to our level. Which one is better for you? 
Btw as a high risk class as shinobi, I do expect the same dmg as them. High risk, high reward.