Only one point. You may not get many, if any, do overs to fine tune things. You need to go with something that will work, period.
I get that. I do. But what that is is Assisted Living. That's a 2-room apartment and a nurse.
Yes, that's an extrapolation beyond your intent. I mean to show that there is a continuum here, and I am somewhere on that line - maybe a little further away from that end than you believe... Maybe a little closer to that end than I believe.
Your engineer's mind sees cathedral. My systems mind sees bazaar.
I am a critical path thinker. I like options. It's basically the same cellular platform, so our argument can't be about that. It's the bells and whistles where we've got a grind.
I like that the AI can be in every room. I like that the AI can be summoned even if I'm buck nekkid in the shower. or if I fall over out in the yard. I like all the other things it can do besides an emergency call. I know, I know... That's the whole point, and all the rest is shiny shit... That's true. But that shiny shit is there.
And while I am committed to one platform, I am not committed to one device. It's such a distributed platform that it may well function without cellular - It may be able to function by either cellular or network, with several, if not many devices - I might even get it to work over a landline. That's maybe three ways it might work... and with more than one device, hard failure has far less risk.
So I get your argument, even if I did predict it.

I think the AI thing is worth a look. It is a good first step because it is distributed and works nearly anywhere - Granted, not as well as at home, but a single platform that reaches anywhere I am in town. And at home, eventually, it will be ambient and everywhere inside the house. That's a very flexible and distributed system.
That's what's needed first in my mind. Coverage. And if I need to go to a red button or something, I can always do that later.
That's my thinking.