A business is a living entity with needs of its own, and unless the leaders pay attention to them, the business will fail. There's only one way of knowing what those needs are: by looking at the numbers and understanding the relationships between them.

Numbers will tell them how good your sales are, whether you can afford to hire a new salesperson or office manager, how much cash you will need to deal with new business coming in, how your market is changing, and so on. You can't afford to wait until an accountant tells you these things.