Iron Fist gives too much yields for a single policy point. It doubles science, culture, and happiness from vassals which can be a HUGE boost if vassals are a sizeable part of your yield income. In many situations I feel obligated to take Autocracy for this tenet alone, especially since it is T1. I don't have exact numbers, but over the course of many games Iron Fist single handedly skyrockets me to the top in science/culture/happiness. Something like +700 science, culture, and +50 happiness is fairly common. I don't think any policy can give as much as this. All of this is on top of the very useful effect of preventing vassals from rebelling which would still be completely worth taking as a niche policy. Edit: Possible solution maybe something like removing the yield boon altogether, and maybe adding something like increased CS in vassal territory, or forcing the FRIENDLY status on them so that you can always repair things in their territory.