These security trade-offs are not really OK on desktop either, but Windows (and macOS) have a long tail of backwards compatibility they are trying to maintain a

These security trade-offs are not really OK on desktop either, but Windows (and macOS) have a long tail of backwards compatibility they are trying to maintain and slowly steer towards similar security levels (as in the case of the mac app store or the windows store platform). Both of those platforms are struggling to do that although have made some incremental progress but nowhere near the degree that iOS has. iOS was designed very early on with heavy sandboxing and as a new platform that was happy to break many of the norms of desktops. They have been very successful in having a usable platform that is heavily sandboxed and closes more of these snooping holes over time. Of course the trade-off has been flexibility and it has taken them a long time to get where they are now and have a usable OS and also have such sandboxing. (remember the first iPhone didn't even have an app store!) To some extent most applications moving to being web-based has won a lot of this sandboxing on desktop that it wouldn't have otherwise had, and web apps cannot read from the clipboard in modern browsers.