Unfortunately, I/O is probably the worst example of a monad there is. The next worse example is the state monad. The "Maybe" monad is much better example, especially for beginners.
You might like the Clean language more, where I/O is done with unique types. And then, once you get tired of carrying this "world parameter", you might say to yourself, "Why don't we tuck this boilerplate away into a function, so that we don't have to mess with it all the time?" Bingo, there's the usefulness of monads.
And to answer the OP's question, there is essentially no reasonable reason why anyone would use monads in Perl. Besides the fact that Perl's syntax makes it heavyweight and messy, its lack of static typing makes it hard to program in a functional manner.
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