I know, but take out the phone from your pocket, unlock it, press a button (or say Ok Google), wait the usual 1-2 seconds, and then say “turn on kitchen light” … takes overall easily 5 to 10+ seconds : that’s way too long for my use/wants, a Google Home is way better, or a Watch if the GH is not around.
With the watch it takes overall 2-3 seconds … it does make a huge difference to me.
Other example, I used to open my car gate, when approaching from the outside, around 100 meter before, to make sure when I arrive the gates are wide open without me having to wait: so in the car, while driving, I would pull my smartphone and use Google Assistant, or just my fingers (an HTTP shortcut widget of a POST URL to issue a HASS command): dangerous and uncomfortable.
Now I use the watch while keeping the hands on the wheel (very briefly one hand off to double tap the button on the watch).
I am very happy with the resut, and I recommend it to many