Because science is based on observation. Even though we initially won't understand how their technology works we will know more about what is possible. This information will allow us to ask better questions and over time learn more about our universe.

I used to work as a developer in the point of sale industry. We needed to print small 1/2 inch labels from an Epson impact printer. At first I didn't think it was possible but then saw one of our competitors were already printing them. Seeing it happen not only told me it was possible but gave me clues how to do it.