Sounds to me like a silver bullet idea. "LLMs will make it good".
I don't think voice is a good interface. "It chats like a human" is the lowest possible hanging fruit in terms of product design, and bets everything on the smarts of the tech that's behind it.
We are so used to tooling faster than voice. Keyboards and taps are very, very fast. I want digital assistants as smart AND as fast as that, not something smart but incredibly slow to interact with because it needs to dumb itself down to human speech I/O.
To me, this is also not about modality or making it more generic. I just don't want an anthropomorphized smart-ass assistant. I want smart tools that actually assist me directly, no chat.