And copy and paste. People seem to always forget the power of it. It's the GUI equivalent of "Search for that on Google" or "Now, SSH to this IP I found digging through AWS." Copy and pasting of text from application to application is the clunky Unix Pipe. It's universal and deeply important.

Taking sections of the last response, or hell, even having every response essentially be wrapped up in some sort of object you can reference in your next query to the interface is what all of these lack.

Even Androids "Search this artist" doesn't quite get there. The lack of context between queries is what murders Siri for me. That and her seemingly random selection of what goes to Google and what goes to Wolphram Alpha. Sometimes even the "wolfram" verb prepended to a query just doesn't go to wolfram no matter what.