I dunno. You see the same pattern with chained class methods in Python and it suffers from the same exception specificity problems, but doing it is still a fair judgment call. Sometimes all you need to know is that there was an error in the chain. Like if an exception is raised by dataframe.transpose().to_dict().values() I don’t ask myself where in the chain the error occurred, I just think, “oh that’s weird why couldn’t I turn that into a list of dicts? Did I call those methods on the wrong object?”
Your point's well taken. I'd say that there is a bigger issue in the case of flatMapping side-effectful monads because they're typically dealing with things like writing/reading from databases and the error cases should be thoughtfully considered (do I have to roll something back or perform compensating actions, or clean up anything?)
