On one end of the spectrum, you have people who use gmail all the time who expect a button to be someplace and will just click it from peripheral vision. Some may not even notice that it's orange, others may subconsciously ignore the orange since these days UI changes all the time but nobody's going to put a prominent button at the bottom of an email form that's not "Send", right?
On the other end of the spectrum, you have folks who are not used to the internet at all, and only use a couple of sites (like gmail) after being instructed how to by friends or relatives. These folks know to click a "send" button. A "send" button with a little microphone drawing looks totally ok to click from this POV.
On one end of the spectrum, you have people who use gmail all the time who expect a button to be someplace and will just click it from peripheral vision. Some may not even notice that it's orange, others may subconsciously ignore the orange since these days UI changes all the time but nobody's going to put a prominent button at the bottom of an email form that's not "Send", right?
On the other end of the spectrum, you have folks who are not used to the internet at all, and only use a couple of sites (like gmail) after being instructed how to by friends or relatives. These folks know to click a "send" button. A "send" button with a little microphone drawing looks totally ok to click from this POV.