Elite pass rushers can do that, but that's why they're elite. What about the rest? There are very few elite pass rushers. In a group of 10 good pass rushers, how do you rank them? Just by sacks?
If you have 2 elite pass rushers, 1 with more sacks but fewer forced fumbles and 1 with fewer sacks but more forced fumbles, which would you call the better pass rusher?