A policy is in a shared library. A copy is in an email. Someone has saved another to their desktop. The person who wrote it knows which version is approved—but the person who needs it may not.
For an employee trying to follow a procedure, complete an induction or find the right template, that uncertainty creates unnecessary work. For the business, it makes consistent processes harder to maintain.
The answer is not necessarily to replace SharePoint. It is to make the boundary between work in progress and approved company information unmistakable.