Well, considering everything outside/before whisper would be less than a 40% accurate on my voice (don’t know the reason and now whisper is close to 100% even with tech stuff/abbreviations). Things like Siri, Google, Alexa, Dragon etc all never understand (I stopped trying, so it might have improved, but I did try not long ago) anything I say. When I ask for the weather, something like Siri looks on Google what the border is etc. I am not native english, however I am fluent (work in English fulltime) and humans never have any issues; also, in my own language, none of them work either, except whisper, even locally running (which, like said, might’ve improved recently).

So it would be interesting to hear how articulated you would need to speak and have different people with accents and such.