Imo it is an organizational thing. Big is good, powerful and important. The more subordinates the more powerful a manager is. Allocated resources (e.g. dev hours) must be spent on something and more often than not must deliver just a little bit short in order to allocate more the next time. Overengineering is rewarded, it creates more tickets to work on and keep the people busy. Then on the other end there are the resume driven folks, who are mutually interested in piling up complexity. Still, invoking Hanlon, it can not be ruled out that some people just do not know better. Sometimes I think KISS is directly at odds with enterprise development.