> for die hard DF fans who know all hotkeys inside out there's little actual reason to switch to the Steam version

They made the game so much more playable it's hard to understate. We're not even talking mouse vs keyboard here. They made one of the core mechanics (labor assignment) go from something that essentially required a third party tool to manage to something that is trivial to manage in its vanilla state. Sure it took some adjustment for long-time players and some prefer the algorithms used by those custom tools, but those tools are being made available.