Hi, I have had a look at the tour,
I think the headline is that anything to reduce mental load needs to not add to the mental load. There is a possible benefit to it, but there were parts that made me think that you are coming at it from a very male perspective, which is why I believe you have had the feedback you have had.
A digital family calendar is useful, but other solutions only require a one-off payment and come with a flat screen for the kitchen. From working with clinical systems, much of the feedback you are getting is similar to what I have heard before. Yes, there is power in the data you add, but the value of that information comes at a time cost in manually inputting the information. If your app is integrated with calendars and other apps, then maybe being a central place would be more attractive, with more by-product reporting.
I speak from having used Noom, intimately us and better me. I am someone who does like an app, but inherently, you start well but end up using only limited functionality. If you want it to be successful, you certainly need more female input to do that. I think you need to look and read more widely than your own experience. Have a read of "This Is How Your Marriage Ends" by Mat Fry and "Fair Play" by Eve Rodsky
I would also join up here on MN, change your username and listen and learn. You may find that you don't need an appt when you've been on here a while x