[naravara]

Aside from recommendation engines and targeted advertising, what does this deep knowledge of everywhere I've been and everything I've done do to dramatically improve the experience of using the AI?

I think it makes Apple slower at making their assistant good at parsing what you're saying and returning an answer, but that's a problem that benefits from crunching reams of data in general, not so much knowing everything about you personally.

For one thing, a virtual assistant that works even when I don't have an active internet connection seems like a perk in itself no? The Siri approach is closer to being there than the Alexa/Google approach.