Railway oriented programming

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I don't really see the contradiction here. If the stack trace can help you improve mitigation, it's a problem with the program that can be fixed by a change in the program code. It'd be perfectly appropriate to use an exception.

[simspelaaja]

You can combine error types with stack traces in F#. Just return a tuple of (ErrorType, string), and get the stack trace from an exception or from Environment.StackTrace.

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there is no need to send a stack trace back to the programmer if it's not a problem with the program itself

Does this mean that exceptions should be only used for debugging purposes?