One of my favorite things about this is that we are bringing a GitOps workflow to IT teams. As a software engineer myself, seeing change management and CI coming to other domains within the organization is incredibly exciting!
Source code for Fleet is available at https://github.com/fleetdm/fleet.
Plus having a cross platform MDM would allow an IT team to manage a fleet of end user devices without having to become experts in each of them. For example, the MDM could have push button "erase this machine", etc
Not sure how I feel on the second point. Managing Linux at scale, aside from the laptop point is pretty easy. Maybe companies need better help desk employees.