Trying to match the structure of the iOS app was a mistake. For most types of apps, the Apple Watch today is best thought of not as a platform to port your app to, but a simple remote control or viewport into your iPhone app.
My initial app was easier to conceptualize and learn, and it closely matched the iOS app. But it just wasn’t very good in practice, and wasn’t usually better than taking out my phone.
I wonder how many developers will go through the same process after using the Watch on a daily basis.