[barrkel]

Concurrency means you can't prevent errors. Every time you open a file, it could have been deleted out from underneath you, in a race with some other process.

Most files a program opens are not as a result of user action: configuration, libraries, resources, etc. And usually it doesn't make sense to catch these errors at the point of occurrence, because they'll be all over the codebase. And there's very little you can do in response to them.