I would say the OS is even more necessary for two major areas:

* improved authorization, transparency and control. Presently OS's have privileged and unprivileged modes . AI has too many privileges in unprivileged modes (all credentials, all files). better control over delegating authority is needed.

* improved interface consistency. UIs still inform people on the capabilities and intentions of the machine. A blank text box with an agent is not informative. How many people have the agency to turn the blank box into a creation. A UI illustrates the toolbox available to people and the machines broader capabilities