This website is dedicated to explaining, advocating, and developing robotic systems to do more on orbit. What are the benefits? It really couldn’t be said any better than this new video from NASA.
One of the most ambitious in-orbit assembly projects being studied is to build a very large telescope in space. That concept is explained in detail here: https://exoplanets.nasa.gov/exep/technology/in-space-assembly/iSAT_study/
Robotics for space applications is an emerging investment area as well. The same concepts discussed in the video for NASA science missions can also provide massive new communications stations in space, helping to bring Internet and connectivity around the world.