Units are very critical when working on some kinds of projects like architectural visualisation. One may have to import a variety of files from different softwares.
However the current way in which blender implements units poses a bit of challenge; for example if you zoom in while you are working in meters, your units may automatically change to millimeters or centimeters. This tends to be very confusing.
I believe it would be of great help if blender had a more coordinated units system to better support precision work on team projects.