Required for predictive personal AI assistant?
Not keen on the idea, obvs.
But I can see the only effective way for a predictive personal AI - as in an AI assistant that can truly anticipate what you want/like - is to understand you through revealed preferences.
It can't only rely on what you choose to tell it (either in the form of what you ask as that is too directed, or by nominating topics) 'cos humans spend a lot if time lying to themselves and curating an image of themselves that isn't necessarily going to result in a satisfying assistant. Aside from that even if we were willing to, we wouldn't have the time to give all the information and detail needed for the AI.
It's all the stuff around the outside of what you actively think of that is useful. Using the content of what you are doing every few seconds seems like a way to do this.
Like Google's ai trawling through emails and text messages to form auto responses etc.
(Yes obviously monetization, privacy, game performance, space requirements etc etc I don't like it, just an interesting thought experiment on how to make a useful personal ai).