Good points. The more I think about it, the more I am liking what we are going to see.The solution you're proposing would likely be seen as sub-optimal from Dish's perspective because it would make their service "just another app" on your Apple TV or other streaming device.
But the new Hopper Plus will feature a Dish-designed home screen. Yes, the underlying operating system is Android TV -- meaning that the Hopper Plus has access to the Google Play app store and has Google Assistant and Chromecast features built-in -- but the home screen is controlled by Dish, not Google. When you start it up, you're immediately in Dish territory. From there you can watch their service or opt to launch apps like Netflix, HBO Max, etc. But those third-party apps are "side dishes" while Dish is presented as the main entree.
Beyond that, IMO, using the sort of simple remote that typically comes with streaming devices for a live cable TV service isn't the best. It's nicer to have a full-featured remote control that's custom-designed for the service, with dedicated buttons for DVR, record, last channel, channel number keys, etc. And the Hopper Plus, of course, will still use the regular Dish Hopper remote that has all that.
I dont think some of these streaming services realize how big a deal it is for someone to grab a remote and have the service start as soon as they turn the TV on as well as being able to pick up a remote and press the number buttons to get to a channel.