All software that interops with people, other businesses, APIs, deals with the physical world in any way, or handles money has cases that require human intervention. It's 99.9% of software if not more. Security updates. Hardware failures. Unusual sensor inputs. A sudden influx of malformed data. There is no such thing as an entirely autonomous system.

But we're not anywhere close to maximally automated. Today (many? most?) office workers do manual data entry and processing work that requires very little thinking. Even automating just 30% of their daily work is a huge win.