I have converted my drop bar fat bike to straight MTB style set up. To be honest although the drop bar set up was fine on roads and fire roads it was a pig on proper off road stuff. Since I stopped doing the epic gravel grinder stuff and was just riding the local trails I grew to dislike the fatty. I was all set to sell it but then my wife said she wanted a mountain bike so I decided to let her use the fatty as a mountain bike.
The transformation with the wide MTB bars is unreal. The steering no longer feels like a bulldozer and I have much more confidence off road. The other changes that came with the swap to flat bars were some Deore XT brakes and Trigger shifters. The hydraulic XT brakes are vastly superior to the hybrid HyRd brakes. A fairly expensive upgrade but worth every penny. My gear changes on the fatty have always been pretty crummy and it was always going out of adjustment. The change with the X5 shifters is perfect.
The bike should be perfect for my wife and I intend to borrow it a lot 🙂