When working in a project, you need to team up with colleagues and/or suppliers, and work your way through. This collaborative setting set a demand for a chair that allows you to move your focus from one person to another. Much different from a situation where you are in focus in front of your computer.
In a workshop with your peers, your attention will go from one end of the room to the other. Your chair must be able to follow you, and to allow you to give support.