> Almost nobody uses lazy IO ... in anything large. If I'm writing something small of the form "read stuff from stdin", lazily consuming the results of getCon

> Almost nobody uses lazy IO ... in anything large. If I'm writing something small of the form "read stuff from stdin", lazily consuming the results of getContents is a perfectly fine way of shipping data through the program. As soon as it starts getting complicated, though, it becomes important to refactor (which is often super easy in Haskell). I actually treat unsafePerformIO pretty similar, though with more of a requirement that the project be expected to stay tiny. Worth noting that it's much more important you understand Haskell's evaluation model in that case. ... assuming what you're doing matters. If you're just having fun, it can be a good way to learn a little more about Haskell's evaluation model.