In which ways is Duality better than Activity?

[jragonfly]

Nah, I don't think so, Activity partners see weakness in others that they can improve on, always giving each other advice and at the same time hurting each others weak point. In healthy duality relationship, these criticism is made very lightly, in a way more accepting than if activity ever give advice on each others weak point.

Socionics.com doesn't have good rep here, but I am posting this anyway because it can't be more true.

This is exactly what I have experienced in all activity relations. After thinking about it I know this type very well, it's the dual type I am unsure of. So now I'm left wondering, about any negatives commonly found in duality...