I'll add: 6. Not every software project even has a UI 7. Some software projects have a very specialized set of users or barely interact with users and solve v

I'll add: 6. Not every software project even has a UI 7. Some software projects have a very specialized set of users or barely interact with users and solve very technical problems or data problems (the software I work on now runs 24/7 in perpetuity, and as long as it works, they interact with it only once).