You keep comparing appliances to general-purpose devices. You also act like the "accept to continue" legalese actually matters to anyone but the legal department that wrote it. Please stop.
When someone buys a car, they usually don't expect to run third-party software on it. They use it to get to places. They expect to use the built-in entertainment system to listen to music and maybe use CarPlay or Android Auto, and that's it.
When someone buys a smartphone, they expect to be able to install apps on it. That's the smartphone thing, that's what sets it apart from dumbphones. Third-party apps are what sells smartphones.
> Apple devices are successful because they provide a great value.
Uh sorry??? It may have been true 10 years ago, but an iPhone costs around $1000 now. That's outrageously expensive for what it is. You can say that about midrange Android phones, but definitely not about iPhones. You pay this much and still don't get to actually own the damn thing.
> for example they didn't allow apps to run continuously in the background so that users can have all day battery life
How is that related to the app store? Android does that as well. An app only gets to run in the background if it starts a "foreground service" which shows a persistent notification.
Sandboxing apps and enforcing their behavior does not require limiting what the user can do with their own device.
> This requires continuous work to keep it running
It absolutely does not. If iOS stopped getting updated 5 years ago, no one would've noticed. It's been a finished, feature-complete product for a long time.