I may be missing something, but I don't see how just forgetting to handle/propagate the error (and, say, causing data corruption by continuing with whatever empty/partial return value the function happens to give) would be a conscious decision.

Even when it is intentional, like writing some quick/dirty code and planning on handling errors properly later, I'd imagine it's difficult to grep for instances of unchecked errors in the way you can with `.unwrap()` - though tooling should help.