From personal experience... my grandparents had one in their house (I think it must be a decade old) that would wash and dry everything. You could control the temperature and water pressure. It also had temperature controls for the seat. I think there were more functions I didn't know how to use.
It is strange that we haven't made this as comfortable an experience as our modern technologies/engineering allow. It's the equivalent of us still using the same type of mattress they used in the 1920's. I sleep on a "sleep number" and it's WAY more comfortable. I should be able to take a deuce on a way more comfortable toilet. Heated seat, automated flushing and paper dissension, automated seat rising and collapsing. When you are done using it, it should revert to a "closed" or "sleep" mode. The flush should be a pleasant sound enhanced by audio of your choosing etc. It should be a personalized experience.