That actually seems like a really interesting observation. I've never specifically thought of systems in terms of UI v. AI before, but it makes sense if you thi

That actually seems like a really interesting observation. I've never specifically thought of systems in terms of UI v. AI before, but it makes sense if you think of all operations in any computational system as the result of data manipulation by some "intelligence", and user interface as more specifically the interface between that data and user intelligence. In a computational system, computational intelligence will be used in all instances possible, until such a point as it is either insufficiently advanced or insufficiently informed to continue without making a call to the user intelligence. Thus, the more advanced a computational intelligence and the more information at its disposal, the less interface with user intelligence necessary. By that reasoning, it follows that the ideal or perfect interface would be one which treats the user purely as a data source (more precisely, as the absolute last data source in the pecking order – one to use when absolutely no other data source accessible could possibly provide the same data or make the same decision with reasonable confidence). In that sense, it's likely that going forward we'll see UIs moving more in the direction of Now / Wolfram Alpha / Siri and using such mechanisms to manipulate and return greater amounts of information.