The car analogies are usually quite poor. However, it depends on your use case. Echo Dot's have a mute button which prevents monitoring, or at least it seems

The car analogies are usually quite poor. However, it depends on your use case. Echo Dot's have a mute button which prevents monitoring, or at least it seems so. I'm not an echo power user, so my needs are definitely different than for intended uses like home automation. I think for some, at least users like me would like a feature similar to "su". I'd like to confirm that Alexa should start doing stuff if it has not been confirmed for x number of minutes. I think the real problem with these home assistant devices is they are not designed with a confirmation message. This would be annoying in some cases, but surely a balance can be struck. I'm not trying to be reductive at all about the car analogy. When you turn on a car, you acknowledge that the engine is running. You can also mute an echo if you have the foreknowledge that you will not be doing activities that require voice activation.