Here is what I had to say on my graduate school application regarding object oriented operating systems.
I am interested in object oriented operating systems for their potential to reduce application complexity. The current abstractions we use for interacting with the computer do not do enough to manage repetitive and error-prone tasks. For example, should application developers have to worry about persistence at all? An object oriented operating system could handle that. Application developers would simply request an object from the backing store, manipulate it in some way, and forget it. There is no need to keep track of different types of memory, such as disk and RAM; virtualizing all memory and having the OS deal with the difference between volatile and non-volatile storage reduces complexity for all software using its services.