As for the battery, this doesn't look like a kind of device that's intended to travel with you room to room---but I agree it would have been smart for them to give people the option.
The right app, in the right place can make a lot of sense
Arguably part of why those app ecosystems worked so well was because they were a cross-platform app experience and iMessage only working for Apple devices and most iMessage apps only capable of strong experiences in "blue chat" iMessage user only streams was always a hiccup for why Apple didn't see a larger uptake in the iMessage app ecosystem.
Infuriatingly though it appears to have zero data saving of preferences. I have to manually type my home address and select driving mode, every single time. It's like 30 taps when it could be 1. I sent them a Radar. I'm sure it will never be looked at.
Just now, I realized I can just vibecode my own version.
The battery issue, I agree it is kind of a single room device, but I could see wanting to move it around the room I am in. If I am say, washing dishes versus cooking at the stove, versus doing prep work. Right now I move an iPad around with me in the kitchen. Also, for when there is a facetime call being able to best position it for what I am currently doing verus having to move to the device and face it.
I think the aspect ratio makes sense for the form factor, recipes, FaceTime, music, etc. but it won’t be a very good video device.
Wveryone tried to put app atores inside messages because that's what all messaging apps in South East Asia do.
However, none of western companies ever actually understood how that works.
"Additional apps. HomeView supports compatible third-party audio and video apps from your iPhone for a familiar experience across devices."
If I had to guess this would be kind of similar to the way CarPlay supports apps, but it's admittedly possible this just means "you can use AirPlay yaaaay".
That said, since it's USB-C, it's possible to put a battery pack on it. Cue the third-party ecosystem making a specially shaped battery that can attach to the base (or compatible stand mount with battery for the wall-mounted version).