This makes me want to quit webdev and never look back. Why the fuck are we recreating operating systems in the browser? We already have operating systems. We already have containers. We already have native code execution.
Not automatically, but it can mean that, and in my opinion it is true in this particular case. Safety is not defined as the complete absence of risk.
It completely depends on the specifics of the app. Some apps benefit from tight device integration. For others it's a waste of resources that could be spent on features.
Dude you live on such a black and white world