Well, like every business these days, people are not only NOT rewarded for solving problems, they are actually penalized for doing something that is 'not in the book', even if it's better. This is supposed to be better for companies bottom lines but IMHO, it's not. I had a Tesla Solar Roof installed after my PWs were installed and if a Tesla employee had not acted on his own, along with a couple of rouge engineers, I suspect I would have ended up with a system that did not work properly.
Now that I am off my soap box I think it will work OK, just not as good as the solution you could have. They are basically just going to set your thermostat to OFF if I read it right. I have seen lots of commercial solutions that do just that. Before I bought the 'variable speed heat pump pill', I was going down the same path as you. And Tesla probably would have come after me if my system failed since I would have had to add on to what they installed.