I have really liked the collab emails. When I someone adds to a shared list that should be a realish time notification which we should account for. Is it possible that there is a specific date/time where things are more important that others? Monday morning - 8:00 - 9:00am. Friday evening 5-7pm. So what if we send a “is there something you need to remember?”. Is there anything you want to remember? Or send them a notification of what they wrote down at that time. The first thing you wrote within a certain time frame ? This way if you have written ~anything~ down then you will get a notification of it 3-4 days after you wrote it. I also think we could suggest performing actions that should make their lives easier - “See how to make lists in Twos” or “would you like to start a grocery list?” 3 days after they write their first thing. We could also A/B test which suggested actions/notifications are best.