I've really enjoyed seeing how different Forged in the Dark games change the mechanics used in Blades. I know my first hack started because the genre I wanted to design for didn't really fit the faction system, so that was the first thing I started modifying. I then ended up leaving out the claims system because competing for territory didn't make sense and other forms of claims didn't occur to me at the time. (I'm revisiting the claims idea now in my design).
For everyone else working on a FitD game, what were some of the first mechanics you decide to change? Or what were the systems you ended up leaving out entirely and why?