[bayindirh]

Even my "ancient" iPhone X does it so rarely, I don't lose any context. Even if it's happening more frequently than I notice, the apps also restore their contents.

macOS supports context restoration for 7-8 years now at least. iOS has inherited that soon after, so any application "killed", they SHOULD return to the state they exited, given they are implemented correctly.

[qn9n]

Pretty sure they just use compressed memory and swap for apps that haven't been used in a while, similar to macOS.