The multiclassing section:

It's rogue, not rouge.

Secondly, you can make strength based attacks with finesse weapons and so long as the weapon is finesse, you can use sneak attack) Barbarians don't have a lot of bonus action uses by default, and they get bonus damage on every attack while raging, so a barbarian rogue duel wielding short swords is actually pretty great.


Example at 7th level:
Barbarogue:(1d6+4+1d6+3)+(1d6+4+3)+(1d6+3)=31
Vs.
Straight Barb:(2d6+4+3)+(2d6+4+3)=28
Vs.
Gwm:((2d6+3+3+10)+(2d6+3+3+10))*0.75=34.5

Obviously I'm not looking at all of gwm's effects. but my point stands, that rogue is a great multiclass for barbarian that doesn't even make you fall that far behind on damage.