> I can just as easily press 1 as I can say a word, and when I press 1, there is a near 100% chance that the computer on the other end will understand my command.

So, I would rarely say something when I could push a button, but when using a smartphone on a call, it's not always easy or obvious how to push a button. Some people may have mobility issues making it hard to push a button, or be on speaker phone far away from the buttons. Or, maybe they haven't updated their telephone equipment in 50 years, and only have a rotary dial. Or, maybe on a terrible VoIP system that can't manage to get the tones through.

There's probably some way to clean up the script.

"(Please listen carefully, as our options have changed.) Please choose from the following options: Say prescription refills or press 1; say insurance denied or press 2; say referral to veterinary care or press 3"

I could get behind voice interfaces for more things if the commands words were documented, clear, and consistent, and the damn things worked. Until then, buttons seem good to me.