The email use case is interesting, though I feel like dictating via intermediary AI sounds more tedious to me than just using the email app on my phone.

It's not the dictating, it's the clicking and the finding and addressing and the formalities. For a transactional email it's a lot, especially if there's substance to it like needing to click a link and make a choice about some options.

I love the idea of AI agents writing emails that will only ever be read by AI agents.