I don't get the AI companies' fascination with voice-only input and audio-only output. It's a strict subset of what the device in people's hands can already do. Further, every single product that has aimed for this has flopped and you would think they would get the hint by now...
Voice input will always be less accurate than writing. Voice output will always be slower than displaying writing on a screen. Input accuracy is even worse if you don't have a perfect mid-atlantic accent.
I can only come up with two explanations for why companies (not just "AI" companies) keep trying to force this on us.
1. They have so much money they don't care, or they are using investors' money and have a robust contract in place so it's OK if they waste the money.
2. The profit from selling all the data from inside your house is worth loads of money. I can see how knowing exactly what is being said in every household could be valuable to many different customers: advertisers, governments, health insurers.... note also that none of these customers have your best interests at heart. It gets even worse if you work from home and these devices can listen to confidential business calls.
I don't allow any such devices in my house. If I visit people who do have such devices, it's fun to mess with them. Obligatory XKCD: https://xkcd.com/1807/