I would think that one of the most overwhelming strengths that any manager brings to business is creative solutions to problems that can stall or stagnate any organization.  These threats can be both internal and external.  The manager has to be a visionary to be able to predict and be proactive about these challenges such as external competition, market sensitivity, the pulse of the arena that might prompt contraction or expansion and how an organization effectively responds to these realities.  At the same time, there can be internal threats such as lack of worker productivity, morale issues, as well as ensuring that there is a constant and open line of communication between expectations for success and the delivery of said success.  These forces are critical within any business organization and are vital for success.  Managers must be able to read and react to these conditions.

Management is the group of workers in a firm who are responsible for planning and coordinating the work that is done by the other workers.  The managers, in general, do the thinking while the others do the work.

Management is very important in any business that has more than just a few workers.  The firm's work must be planned so that it can go smoothly and efficiently.  The various parts of the process must all be coordinated so that there are no hold ups in the process.  In addition, goals and long-range strategy must be decided upon.

So management is very important to any business above a certain size.