The goal has to be that work which keeps repeating starts being done in a predictable way. Take an ordinary order. Customer enquiry. Quotation. Order confirmation. Stock or capacity check. Procurement or production. Delivery. Invoicing. While there are a few such orders a day, people can talk to each other. Once there are dozens or hundreds, it is no longer enough for everyone to “know their bit”. It has to be clear where the process starts, who takes the next step, what information has to be available, and what happens when something deviates from the standard.
That is not bureaucracy. Bureaucracy is a process that exists for its own sake. Good structure should do the opposite. It should reduce the need to reinvent a solution for every recurring situation.
And one more thing. Structure should not be built only for the business the company has today. It is worth checking whether the current way of working can carry the next phase of growth too. Because the problem usually only shows once volume grows again and people start firefighting more and more.