But doesn't any todo list app work for that use case? I haven't thought about this space as much as you have but knowing what my wife complains about leads me to say that there's much more value tackling the problem of making
her life easier.
I give suggestions but there's very low value in making it easier for me to provide suggestions. Her side of the equation is where the real work is and it's where you can do a ton of optimizations and have a loyal user.
Making her trips to the grocery store easier > the incremental value she gets from my collaboration.
Enough of the suggestions though. You've thought about this more than I and my only data point is my wife. Congrats on the launch and I'll tell my wife about the app.