Even just the free iPhone app with free-tier GPT3 is better than Apple offers with Siri (low bar, but still) in many regards. Imagine that built out, and given system-level access to your phone tools, emails, calendar, and your smart-home tech (as Siri has) - there's so much potential there.

(I'm not sure I like the idea, as at this point I have no reason to trust OpenAI with my personal data, but it's undeniable that the potential is there.)