It also assumes it does understand what you said. My experience is: it doesn't even when I do talk English to my phone. Obviously that is my fault. I'm not going to deny that.
Where I live, you see/hear no one use these systems.... For good reason.
On a decent keyboard, all of those are -by the way- faster than what you say. You conveniently omit the "Sir/Alexa/OK Google/Cortana" detection phrase, then your inquiry, then the processing, then the verification of what has been detected, then the acknowledgement of the fact that detection has worked correctly. Otherwhise you get such things as "When date LGBT closet tonight". Not really acceptable.