The main selling point of a macbook is not that it can identify exactly what you say, when you said it, and send that data back to a central server that is "always getting smarter". There is also a VERY big difference for me between the things that I type into my computer and the conversations I have in my home. I say many things in an imperfect form or with a dry sense of humor - I rarely save incomplete or out-of-context thoughts to a .pages file on Dropbox.