Blocking is so unbelievably important. It's something I think people overlook dramatically, but good block helps actors pull off fantastic performances. There are infinite ways to tell a story, its these decisions that help a viewer feel a performance.
This video from Every Frame a Painting (which if you haven't checked out this channel... stop what you're doing now and watch all of the videos), while a few years old, addresses the importance of blocking through the wonderful performances of the late Robin Williams. I miss this man so much. What an inspiration.