Earlier quoted context omitted.
Having to say "OK, Google" instead of just "Google" (or "Alexa") is a deal-breaker. Google's products don't feel like they are designed by humans.
I feel the exact opposite. "Alexa" feels like a very clunky attempt to humanise something that isn't human.
alexa and google home are still super-primitive, but as they get more sophisticated, thinking of them as people will seem like the most natural thing in the world.
(i do get where you're coming from, but i think it's a perspective that only makes sense for (1) the very technical and (2) is not long for this world.)
(it's sort of analogous to how originally in internet search engines, you had to put in very precise search terms, and unsophisticated people would just put in some sort of sloppy natural language query. but as the search engines got smarter, the precise stuff got ignored and sloppy was the way to go.)