Corporate travel is an example. In many organisations, you tell someone in the travel department "I need to be in Tokyo for this conference from Tuesday to Sunday, and charge it to this cost code", and they figure out flights, accommodation, etc for you, with minimal input from you.
… 23 hours in Denver later…
But my routine business trips in the CONUS with strictly defined booking options... let me just email an agent "Get there by meeting on day A, leave after meeting day B" and have it sort it all out without the drudgery of the corporate travel portal. YES PLEASE!
A human assistant is largely a status symbol. Most people are not really that busy. The real problem with an agentic assistant is if everyone can have one then it no longer acts as a status symbol.