Probably a greater need for a yearly marketing plan and advertising budget.

My experience is that the larger the company is, the less chance is you will find that they have a “business plan”.

The only need for a business plan is if you are a startup trying to borrow money, or to raise capital (through a private or public offering) which I doubt if many of your readers will be doing.

Most small companies are not going to be successful borrowing money or raising capital anyway (unless it is through family and friends).

Better off to have a good sales pitch, a firm handshake, and a memorable call to action.