[oneeyedpigeon]

I feel like this is misrepresenting the article's point which isn't literally "hello world is buggy if it returns success on failure" but more "you should do error-handling". In this very specific case, you can argue that it's irrelevant. But if your program writes to a log file, or writes to a data file that it later reads from, it had better include some error-handling.

The fact that there's redirection is a ... misdirection. The redirection is only used to proxy a real-life case that can happen even when no redirection is taking place.

[autoexec]

What's the real-life case where hello world fails because the file system is full?

You could do all kinds of things that would cause hello world to "fail". A broken monitor (or even one unplugged) wouldn't show "hello world" or give any indication of an error too, but it's hardly the codes fault. The code does what it's supposed to and ignores all kinds of other things that could go horribly wrong. That's not really a bug, just a known and expected limitation of the program's scope.

[oneeyedpigeon]

As I said, not hello world necessarily, but any program that writes output can encounter this problem, and there's an overlap with general file-writing even.