"Apps were amazing, and a better experience than what came before; that doesn't mean they are the best experience, and anyone who has seriously used an agent knows exactly what I mean.
Apps get in the way, which is to say that integrating with them is to make your agent worse.
I don't want a different UI per app, when I have at my disposal true UI — the Universal Interface for everything digital."
I'd add that today the only post-app UI is chat, but that with infinite software we could have any number of self-assembling UIs, with chat just one flavor.