My primary motivation was/is about creating a simple and consistent user experience for all of the content. I am saving quite a bit of money, but that was not the primary goal of this (ongoing) project.
We use the HDHR for OTA broadcast as it still offers the best picture/sound. I have traditional cable service principally for the TVE, netflix, hulu/espn+/disney, amazon, hbo max, and a few others as well as a fair sized library of movie/tv content.
All running through 6 ATV4s on a variety of TV and AV equipment. Say what you want about the silly ATV remote, but it is dead simple.
Now my wife/family (and her mother and family when they visit!) can easily and reliably access all of the content on any TV without ever having to call tech support (me).
Channels (live tv and recorded content, now including the library) and the ATV app to aggregate and manage the streaming services are what make this possible and I am extremely pleased with the result.
While there is still plenty of room for improvement, the folks here at Channels continue to delight and surprise with new and compelling features. Now if I could just get Apple to take a few steps forward...
Anyway, thought I would share a different perspective. Hope you find what is best for you.