There are two things to note here:

1. A cross-application connectivity layer that pipes data and actions between apps

2. A natural language interface to control #1

Thinking about them separately is useful, because although chat is the new UI hotness, #1 is valuable on its own and the two can potentially be deployed separately.

As presented here, I suspect the natural language interface will be faster and easier than buttons for operating the cross-app layer for complex queries, but potentially slower than operating buttons for simple things (like "start dark mode").

But personally, I believe #1 combined with some AI context awareness is more powerful of the features.

...

And btw, I left Apple last year to build a local-first and developer-extensible assistants for the Mac that's pretty similar. If this interests you, would love to chat (email in profile, as well as a waitlist).