There are several reasons for following these steps. Scientists must be sure that their investigations produce results that are as accurate as possible. Of course, there are also times when information is discovered by accident as an unexpected result of an investigation or even because of a mistake in a planned experiment. Scientists may also do some of the steps in an experiment in an informal way at first to gain knowledge about how to set up a more formal experiment. Following logical steps to learn new information is not unique to science.
People do informal experimentation all the time.
Trying a new product and comparing it with other similar products is a type of investigation to find information about what product is preferred. However, a logical procedure is still needed to make it meaningful.