I think the impression, that "AI" would make it easier is not only far-fetched, but utterly misguided.
So far it hasn't made anything easier (support call lines are the proof of that).
I understand the picture of that outcome, which you'd like to have, but our real world experience just doesn't support it.
> requiring button pushes, or anything else other than voice, should be avoided if possible.
Well, even movie tropes often show, how that is not the case. You might be able to push a button safely, if the intruder in your house, but will be unable to comply with "I couldn't hear you, could you speak in a loud and clear voice?" without compromising your safety.
> and its been working really well
No caller satisfaction surveys, no comparison with tried and true button approach, just statements from parties with vested interest.