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Two areas where F# might be preferable:

- You can use reflection to generate encoders and decoders. These can be mixed and matched with hand written encoders and decoders.

- You can just throw an exception when unpacking a result or maybe into a value

- You can use “?” and “!!” operators to tell the compiler that the type is correct when working with dynamic objects

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> F# might be preferable

For getting something live quick: yes.

But the learning experience of writing some pure-FP code is destroyed by "just throw an exception" and "use “?” and “!!” operators to tell the compiler that the type is correct"

You don't have to use exceptions and other operators with side effects if you don't want to. You can have a pure FP experience with fable and F#. The OP was just mentioning that these escape hatches are available if you need them.

Yes I think they can be removed with linting rules once you are ready to hit production.

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