Plus, you can currently solve a blackout with a generator. Or a backup internet connection in case of your ISP being down. Sounds like neither would solve an issue with these sorts of devices requiring remote servers to be online.

You're narrowing down my line of reasoning to a specific example and then disputing it. But you didn't answer to the overall fact that there are central points of failure in most electronic devices/infrastructure that are even more critical than a vacuum cleaner. Yet we still rely on them. That doesn't make the whole "electric" infrastructure "a mess".

And BTW not every blackout can be solved with a generator. For instance a city-wide blackout, in regard to streetlamps etc. Also, not everyone can install a generator. Not every landlord allows a generator etc etc. Even if you had a city-specific generator, that can just as well fail. Now, if your not concerned with a backup system failing you shouldn't need to be concerned with Amazon's system failing as they also have multiple backup systems in place.

I was talking to @jessaustin and not really interested in debating the entire topic. Just saying that an individual in a given situation can have some control over things like power and connectivity, but zero control over their IoT device working if the server goes down.