1) Most of it is just not very useful.
2) I like opinionated software built by obsessive people. This isn't that. You can smell it.
3) Most importantly, these AI/chatbot/nudge/assistant/automation tools have a critical flaw--they're not predictable. Trying to manage them is like keeping a bunch of state in your head at the same time and it hurts. Which device is going to remind me? When? When will it remind me exactly? An hour before? 5 minutes before? Are my notification preferences saved from my last device that I recently replaced? Are my notifications turned on? Do I have sound turned on or only badge icons?
I think software works best when it has a bounded utility, not popping into your life unexpectedly 24x7, but being lightweight, simple, useful, and predictable for the 30 seconds you need it and that's it.