We are still figuring out the UI for AIs - making it invisible, zero-click, part of the main input.
Gives Copilot and lex.page as examples; that the bot shares the input box you are using.
Problems with prompt engineering like random phrases you need, that can break between versions.
Either due to dataset changes (like artist names in Stable Diffusion v2), or just other model changes.
And the general interaction pattern; i.e a chat vs a text generator in a document.
Language models hallucinate, and solving that is AGI-hard.