Siri’s huge promise has been shrunk to just making voice calls and sending messages to contacts, and maybe getting the weather, using voice commands. Some users find it a reliable way to set timers, alarms, notes and reminders, or to find restaurants. But many of these tasks could be done with the crude, pre-Siri voice-command features on the iPhone and other phones, albeit in a more clumsy way.
I've mentioned this before, but Google's assistant (as demo'd at this year's I/O) has got it light years ahead of Siri. Siri needs to up it's game, pronto. There are certain places--like the car--where I need to be able to talk to the phone and have it understand what I want it to do. Anything from playlists to picking something up to eat on the way home. Google can do this, why can't Apple?
Simple: "Because Apple can't buy anything better than what Google can invent." (h/t Piller)
Google has put the work in on this, Apple hasn't. Period.