This may sound strange and even callous, but I think it's appealing to people who are used to having employees. It's not about speech being a better interface, it's that thinking hard enough to sit down and compose a prompt is too much work if you're used to just yelling at someone.

Pity the managers with no one left to boss around besides the machines coming for their own jobs.

I was asked just yesterday if I could wire up [redacted] so that [redacted profession] could have a realtime voice interface while in the middle of performing [redacted]. My basic answer was yes, but it would be a bit slower than you want if something is going wrong, and it would probably be unethical for a whole lot of reasons.