Competitive Edge: It's important to define your competitors too. One should know, what strategies are being used by the competitors to reach to the potential customers. If you know what your competitors are doing, you will be able to modify the plan and maybe your marketing analyst will come with something more innovative that can capture the mass attention.
Imagine if you can do all these and manage all these in a marketing plan? Systematic, organized, well thought, innovative and captured all your pertinent business information, don't you find having a marketing plan is useful for your business?