The point is the app doesn't crash. One process (object) crashes and immediately restarts. The entire rest of the app keeps chugging away. Compare to a language

The point is the app doesn't crash. One process (object) crashes and immediately restarts. The entire rest of the app keeps chugging away. Compare to a language with one or a few main threads, where one bug can crash the whole system. It's a brillant scheme designed for systems required run for a decade or more with only minutes of downtime (telephone switches).