A lot of the comments on /. were of this nature too, but it misses something important: it’s all about risk and reward.
Yes, a cell phone carries some risk of compromise (a lot, IMO), but it offers something in return.
What the Dot or the Echo or Alexis give in return is stupid and trivial, or at least of dubious value. I mean, seriously?
Being able to say “Hay, Alexa, what’s the weather outside?” and get an immediate response is of no interest to me (I can step outside or type three words into a web browser). Saying “Hey, Alexa, play TMBG” is of absolutely no interest to me – I really don’t mind hitting three buttons on my phone.
As far as I can tell, the benefit/risk ratio for a cell phone is about a billion times higher than one of these assistants. And honestly, I probably wouldn’t carry one of those if my job and spouse didn’t make me.