The architecture you inherited
Look at the company you run today and you're looking at the 19th century. Functions stacked into departments, departments into a hierarchy, each unit tuned to optimize its own piece. It was a breakthrough of its age: it let a company grow far larger than any single mind could hold, by breaking the whole into pieces small enough to manage.
It also left a flaw that is quickly becoming a major problem: the knowledge that makes the company work is scattered and trapped. It sits in systems that do not speak to each other, in documents no one can find, and in the heads of people too busy to be asked. Ask where a company really loses its time, its margin, and its best ideas, and the answer is always the same. Not inside the departments. In the space between them, in the handoffs nobody owns.