Why You Should Delete Your History
You may think you don't have to worry about your history at all if the browser deletes it anyway. Take a minute to consider how many sites you visit within a few weeks or a month, which is the usual time span browsers keep your information. Not only are all your regular activities listed, but at this point, finding anything in your history becomes almost impossible.
Hackers can easily discover what you do, where you have accounts and even discover your account information from your computer history and other stored information. The less information available, the less they can find. This makes you less of a target.
Sometimes the problem is actually in your own home. If multiple people use the same computer, especially the same user account, everyone has access to the same history. If you are trying to shop for gifts or plan a surprise for someone, you don't want them discovering anything before hand. If you're not concerned about outside privacy, at least consider privacy in your own home.
If privacy isn't really a concern at all, take into account the space and clutter. Though all the stored information and computer history take up very little space per file, it can add up. Part of regular computer maintenance to keep your computer running at its best is to clean up your history.
You are not required to store any information, except temporary Internet files and history. Even these can be deleted as soon as you close your browser window. Any other information, including auto-fill data, isn't required.