Unless you have some notion that will make one object relevant and another irrelevant, you're going to be swamped. In order to have something to do, you have to have something in mind. That comes from abduction. Coming up with an explanation that can be tested moves the investigation and guides the accumulation of knowledge, giving way only when contradicted. Abduction helps to make links among events, and the development of the overall theory of a crime depends on adding new links.
Abduction also keeps guessing to a minimum.
While Sherlock Holmes called his method deductive reasoning, in fact, he did more than that. He would observe something about the scene and then interpret it in the context of a case. He honed the skill of recognizing the significance of something that no one else noticed. That means he relied on abduction first before building a chain of deductive reasoning. It's essential that crime investigators work within a guiding frame so that certain items become evidence and certain other items can be discarded.