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## Pros
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- Vital for modern applications
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- Vital for some modern applications
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- Large applications commonly require it
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## Cons
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- imposes non trivial implementation constraints.
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- providing a 'select' and non-blocking IO would be enough to allow people to implement something like it themselves in haskell and are provided by most systems as primitives.
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- Things like the 'poor man's concurrency monad' can achieve some of the benefits
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- only one implementation exists, design space not very well explored.
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- Unsure at this point if new STM will replace older MVar-style concurrency |
